1. IMO, there is overwhelming evidence for ET visitation of earth, though mainstream "proof" is lacking
But that's because the intelligence community, which controls the media, actively suppresses the evidence at the same time putting out a lot of disinfo on the topic. In general, it never fails to amaze me how some people can so adamantly deny the mere possibility of ETs visiting the earth. It's one thing to be skeptical, but another to have such a closed-mind on the topic.