Extraterrestials have visited Earth

"My one argument against this being likely at least in recent history is that there are few examples of serious cover ups working and those that we know about are rarely multinational"The cases I presented, as well as most of UFO cases, date to 1940-1990. During this time it was very easy for governments to hide their experiments so that no information about them leaked into public. One such project, MKUltra, was only made public because some documents considering the experiment were misplaced and later found by authorities. MKUltra was extremely highly classified project by CIA, which subjected random oblivious citizens to various illegal testings with LSD, hypnosis, torture and many other nefarious experiments. These ended up killing multiple innocent US citizens. What makes this case prove that authorities can hide even large-scale operations from the public is that there were no whistleblowers whatsoever. All documents were destroyed, save a few misplaced ones which revealed the "conspiracy". Without that small mistake MKUltra would've stayed a secret forever. [1]1. "Slayton doesn't even think it was an alien saying 'I don't automatically presume that it came from Alpha Centauri' NASA confirmed that there was a weather balloon in the area at the time."Slayton, being an experienced pilot, would not have mistaken a weather balloon for an object going faster than any fighter at the time. But true, there is no way of telling whether the object was from extraterrestial origin.2. "As for the motive, likely narcissism. How many times have you really heard each appollo astronaut, I don't mean the first 3 to land on the moon but all the others? Despite their achievements most are relatively unknown."You make a compelling argument about the Mitchell case, and indeed, his story is filled with holes. I will lay this case off for now.3. As for the Cash-Larundum incident, your explanation is invalid. The symptoms weren't caused by any known radiation or phenomena. This does not rule out possible versions of radiation not yet discovered. Suggesting the symptoms were psychosomatic is absurd. Psychosomatic symptoms cause rashes at best. Whereas with the victims, the symptoms were those of extreme (lethal) exposure to radiation with large blisters and large patches of skin falling off.As for the sighting itself, it's practically impossible to mistake a helicopter for a UFO. Perhaps some secret experimental airplane (though I highly doubt it) but you cannot mistake a helicopter with the rotor sounds. Furthermore, no mirage or military plane explain the hand marking left on the car bumper.Now to the next cases. I will present cases with high amount of witnesses on this round. Next round I will bring the philosophical views into the argument. Take note that not all the cases I present contain over 1000 witnesses.4. Westfall UFOOn 6. April 1966 there was a famous UFO encounter in Melbourne, Australia. UFO was hovering in broad daylight for over 20 minutes. What makes this case so compelling is that the amount of witnesses climbed to over 200. Nearby airport confirmed that there were no planes in flight on that area. The RAAF also reported no military activity in that area. There have not been any convincing explanations about this event.https://en.wikipedia.org...5. Hudson Valley UFO sightingHudson Valley had a dense amount of UFO sightings from 1982 to 1986, over 5000 different encounters. The one that stands out was 24. March 1983 with over 300 witnesses.http://channel.nationalgeographic.com...;(number 7)6. Phoenix LightsOn March 13, 1997 thousands of witnesses saw unidentified aircraft hovering slowly in a "V" formation over Phoenix on two separate events. There is yet to be a convincing explanation for the first event, whereas military alleges that the second event was caused by Warthog flares and unordinary weather conditions.https://en.wikipedia.org...-I'd like to thank my opponent for a lively debate.SOURCES:[1]: https://en.wikipedia.org...