There's plenty of eye witness evidence of extraterrestrial beings. There's even an old video of a suspected Alien being dissected. If you really want to make up your mind about the issue, as I said before, you have to start out with Lt Col. Corso's book The day after Roswell. Its non fiction and has not been disputed as to its validity. Corso, states that he indeed saw a dead Alien that the Army had in a transport box in a warehouse that he was in charge of. There are 2 other Professors that have written about their hypnotized individuals that end up recalling distinct details of being abducted and used for various experiments. Harvard Phd John E Mack's Passport to the Cosmos Feels the Aliens are benevolent toward Humans While Professor David M Jacobs books The Threat, and Walking Among Us, feels his evidence shows them hostile toward Humans and view us only as a Gene pool for creating Biological on command intelligent life forms. Jacobs goes in depth in his books on exactly how the US Gov labels them EBE (extraterrestrial biological entities) have been in breading with humans for the past 50 years or longer. He claims he has clients from around the world that all have the same exact message of Aliens preparing a Humanoid contingent that will supplant normal humans in the coming world catastrophic even. These beings are or have been prepared to take control of the world governments by way of what we all ready see here with the dope in the WH now. The key is what you could call controlled chaos that we humans will not revolt against. If we were led to believe our leaders were in fact from an off world race, all hell would break loose. This is why all the secrecy. The ability of officials to be bought is a huge wide open avenue for them to proceed with their plans. Apparently the Human form is quite unique among biological beings and controlling the DNA pool is a valued prize but must be achieved by consent. Here we are, the cave men of the Galaxy thinking we're hot crap with AI. While "they" go way beyond that with birthing biological programed entities to do their bidding. As Revelation proclaims, the Anti-Christ will have great abilities to perform "miracles" before the masses. Think cattle mutilations as a simple primer. Tech that is way, way, beyond our comprehension has been in open view and used for documented 50 years. Unless you have personally experience of an out of this world encounter, I can understand the SF label folks would put on all this. My first hand experiences, would lean on the very possible side of this dissertation. But really, if your interested in the subject, Read and Read some more.