2 - When they do, they think about extraterrestrials coming here. THAT is what they don't believe.
Face it, all the people who talk about ETs coming here sound like kooks. The aliens built (or helped build) the Egyptian Pyramids ... or the Nazca Lines ... or whatever? Why? Allegedly for navigation. Really? They could navigate between planets fine - but need primitive markings to navigate around a single planet? I laugh at the idiocy.
It would kind of mess up our old concept of being the "crown of creation" and that we are Gods special creation. If aliens can come here it would mean they are much higher developed than we are. That's depressing for some.
It's hard for some people to accept things like that. I haven't seen them either, but that doesn't mean I can just say they AREN'T there. I believe there are things out there, living beyond or in this galaxy.
Religion. Religion is something that should've never been created. Religious people would claim that aliens are demons. They are under a spell and need to wake up. Plus, some people can't handle the truth. Aliens have been here longer than we have. They live underground and there have been lots of UFO sightings. I see and here them myself. I know I'm not going crazy because my father's dog starts barking whenever something weird is flying in the sky. The aliens are here on earth, they are on other planets and they are way more advanced than we are (just throwing that out there) but you can believe what you want to believe. I can't tell this anyone since they think I'm talking bullcrap.
Everyone's not the same just there will always be those who doubt and won't believe in such marvelous things. I on the other hand do believe in Aliens and other things too and don't need proof, but I would like some from the hairy guy such as Bigfoot himself just don't want him to harm me though LOL!!!! xD