People who doesn't believe in alien existence are in these 2 cases:
1)Fear them
2)Too much selfesteem.
Come on guys we said, existance of aliens, not that they are invading us.
I will just ask this question:
Prove me that we are the only humanoids in this galaxy.
No alien stuff, just prove me we are the only smart intelligence that is been able to build computer and internet.
That is a great question, I hope some one weighs in with a positive answer.
When I was a small child, looking out across the river,somehow I thought that people lived over on that side,yet I had never seen them.
In my small childs mind, I just knew that people existed over there.
I was later to find out they did exist, I was correct.
NASA astronauts in some point in their life disclosed about Extraterrestrial UFOs