My oldest grandson and I debate this topic often. He 'was' an avid believer in UFO's... and he still believes in them but today he has doubts.
We're going to rent the movie "Phenomenon" this evening, or next, and watch it. Supposedly it presents the 'best' UFO evidence to date. I'm dubious, but also keen to watch.
And the truth be told... I don't keep up with UFO evidence so I need to catch up. But also being 'truthful' I don't have a very open mind on this topic... I'm pretty much "They don't exist end of story".... but there is a very small part of me that leaves the possibility open... or perhaps it's more of a 'hope'.
A 'hope' because I would dearly LOVE for intelligent life to be discovered elsewhere in the Universe.... and Aliens visiting earth? wow, that would be pretty big news.
BTW... if any of you DO believe in UFO's feel free to let me know... I do NOT think people who do believe in them are foolish AT ALL. - JamesJM