Question: Why is karate only to be used in real confrontations?
About the article "Karate", section "Philosophy".

Candidate passages:
Karate developed in the Ryukyu Kingdom.
It was brought to the Japanese mainland in the early 20th century during a time of cultural exchanges between the Japanese and the Ryukyuans.
It was systematically taught in Japan after the Taisho era.
In 1922 the Japanese Ministry of Education invited Gichin Funakoshi to Tokyo to give a karate demonstration.
In 1924 Keio University established the first university karate club in Japan and by 1932, major Japanese universities had karate clubs.
In this era of escalating Japanese militarism, the name was changed from ("Chinese hand" or "Tang hand") to ("empty hand") – both of which are pronounced "karate" – to indicate that the Japanese wished to develop the combat form in Japanese style.
After World War II, Okinawa became an important United States military site and karate became popular among servicemen stationed there.
The martial arts movies of the 1960s and 1970s served to greatly increase the popularity of martial arts around the world, and in English the word "karate" began to be used in a generic way to refer to all striking-based Oriental martial arts.
Karate schools began appearing across the world, catering to those with casual interest as well as those seeking a deeper study of the art.
Shigeru Egami, Chief Instructor of Shotokan Dojo, opined "that the majority of followers of karate in overseas countries pursue karate only for its fighting techniques ... Movies and television ... depict karate as a mysterious way of fighting capable of causing death or injury with a single blow ... the mass media present a pseudo art far from the real thing."
Shoshin Nagamine said "Karate may be considered as the conflict within oneself or as a life-long marathon which can be won only through self-discipline, hard training and one's own creative efforts.
"In 2009, in the 121st International Olympic Committee voting, karate did not receive the necessary two-thirds majority vote to become an Olympic sport.
Karate was being considered for the 2020 Olympics,—however at a meeting of the IOC's executive board, held in Russia on May 29, 2013, it was decided that karate (along with wushu and several other non-martial arts) would not be considered for inclusion in 2020 at the IOC's 125th session in Buenos Aires, Argentina, in September 2013.
Web Japan (sponsored by the Japanese Ministry of Foreign Affairs) claims there are 50 million karate practitioners worldwide, while the World Karate Federation claims there are 100 million practitioners around the world. 
The Trinidad and Tobago Karate Union (TTKU) is the National Governing Body for the sport of Karate in Trinidad and Tobago.
The TTKU is affiliated to the World Karate Federation (WKF) which is the only world karate organization recognised by the International Olympic Committee. 
Different formats.
One major format of full-contact sport karate is known as "knockdown karate" or sometimes "Japanese full contact karate".
This style of sport fighting was developed and pioneered in the late 1960s by the Kyokushinkai karate organization in Japan, founded by Masutatsu Oyama.
In fighting the competitors traditionally wear no gloves, padding or body protection other than groin guards (although local regulations sometimes enforce exceptions to this tradition), but it is bare knuckle fighting.
Punches to the face, groin, and joint are prohibited but all bare-knuckle and elbow strikes to the body and limbs (with the exception of joints), and kicks (including kicks with the knee) against legs, arms, body, head and face are permitted, as are sweeps.
Grabbing and holding the opponent, including clinching, is not allowed under the basic knockdown karate rules as used in Kyokushin, but are occasionally allowed in some variations used in other styles.
Scores are only made by knocking your opponent out, down to the floor, by sweep and controlled follow-up for half a point, or by otherwise visibly incapacitating them.
Unless there is a knockdown or sweep, the bout is continuous, with stoppages only to break up locked clinches or if the fighters leave the fight area.
Unlike American full-contact karate, or point karate, clean hits are not counted in and by themselves, as the scoring depends entirely on the effect of the hits, not on the formal or stylistic appearance of the techniques.
No matter the perfection in execution of a technique, it will not score unless it visibly affects the opponent.
In the same manner, if a technique does show a visible effect, it does not matter if it is executed in a manner regarded as inferior.
Common minor variations to the basic knockdown rules include Shidōkan karate knockdown that allows clinch and throws (as well as very brief attempts to follow up a throw with a submission technique), and Ashihara Karate and Enshin Karate knockdown rules that allow one handed grabbing in order to execute throws to score points.
Many other variations exist, some so extensive that they can no longer be classified as knockdown rules, and several other branches of full contact karate (typically included in the "gloved", "MMA inspired" and "others" groups) originate as such a variation of the Knockdown karate rules.
Although this sport format originated with the Kyokushinkai karate organization, it has spread until it today is used by many karate styles and organizations.
Karate styles embracing these rules are often called "knockdown karate" styles, and these include both organizations that originated from Kyokushin, such as World Oyama Karate, Ashihara Karate, Enshin Karate, Shidōkan, and Seidokaikan (the style that originated the K-1), as well as styles that originated independently from Kyokushin such as Ryukyukan from Okinawa.
Though severely divided by rivaling styles and organizations (several of which use their own minor variations of the basic rules), and lacking a unifying sport organization, the sport of knockdown karate is today common all over the world.
Despite the lack of a unifying sport organization to hold unifying championships (and the friction between the different styles and organizations), there is a long tradition in most knockdown karate organizations to hold special open tournament knockdown karate events, where fighters from any knockdown karate (or any other) style and organization are welcome to participate. 
Kyokushin has had an influence on many other styles.
The knockdown karate competition format is now used by other styles.
Karate styles that originated in Kyokushin, such as Ashihara Karate, Budokaido, Godokai, Enshin Karate, Seidō juku, Musokai, Shidōkan and Seidokaikan, are also knockdown styles and use slight variations of the competition rules.
A few styles (Kansuiryu Karate and Byakuren) originated independently of Kyokushin and have adopted the competition format.
Kokondo is derived from Kyokushin, albeit without competition with the emphasis on realistic goshin-jutsu (self-defense).
Some styles originating in Kyokushin (Jushindo, Daido Juku, Kudo, Zendokai) have changed to mixed martial arts rules.
Kickboxing has been seen as a natural progression for kyokushin competitors and many of Japan's top kickboxers have started in knockdown karate.
The influence of Kyokushin can be seen in the K-1 kickboxing tournament that originated out of the Seidokaikan karate organization, which is an offshoot from Kyokushin.
Kyokushin is the basis of glove karate, a knockdown karate format wearing boxing gloves and allowing punches to the head.
Glove karate rules are used in kyokushin karate Iran. 
One format of full contact karate competition is full contact point karate.
It is similar to non full contact competition karate; the only difference from light contact and semi contact karate bouts is that if you knock your opponent out, you win instead of being disqualified for excessive contact.
Points are scored for clean hits to the specified target zones, and unless there is an evident knockout or knockdown, the referee breaks the bout after each exchange to score the hits.
The blows are delivered with full contact, although gloves, foot-pads, and in some cases body padding, are worn.
This form of full contact karate competition is mainly found in North America where it originated, although it has a minor following in Europe.
It is also similar to the competition format used in Taekwondo, and the sport karate competitions using this format often blur the line between these two related arts.