UFO’s are not real?
I don't know, actually. I tend to doubt it, at least without evidence. Oh, sure I do believe that in this emmense Universe, we are not the only lifeforms, and there very well may be more advanced sentient beings out there, but have they come here? There is simply no proof.
The fact that some polls show that most people believe that UFOs, piloted or occupied by beings from other planets than ours still doesn't make it true.
Believing that we're not alone, and that UFOs are out and about the Earth and haven't attacked us and therefore are benevolent is a wonderful fantasy and may very well explain "most people's" belief.