It was used in Kosovo, and used by the resistance in Burma and the government in exile of Tibet, it is also used by the White House and the Vatican and every single human rights organization around the world. The U.S. never broke the encryption algorithms of the Soviet Union for at least the past 30 years and that goes for other countries, as well. I don't know how to give it to the public without giving it to the bad guys. Back in the early 20th century, Bonnie and Clyde used cars more effectively than any other criminal before them, and the cops at that time were totally unprepared for that. Some police suggested that cars were a bad thing because it allowed criminals to get away easier.
Cars have mixed effects on society, but most people are glad to have cars.
Like cars, cryptography will have mixed effects on society, not all of it good, but overall people will be glad to have cryptography. Some have argued that we are living in an age of erosion. They say the real threat to privacy isn't coming from overt campaigns by the FBI or NSA, but by thousands of small decisions made in boardrooms all over the world. It is sort of like the story, the apocryphal story, of the frog in boiling water. You put the frog in boiling water and it jumps out and survives.