Belief in UFO = belief in God — this is another New Age barb for your soul. The only objectively correct answer is INDETERMINATE
https://www.youtube.com/watch?v=xTbBMFKPFuc
…it is possible that Cooper was used as an useful idiot — he was idiotic enough to insist that a video roll (at the bottom of a TV screen displying output of consumer VHS tape) was conclusive proof that driver Agent Greer was the head-shooter of JFK — so maybe someone figured Cooper would be a good witness to insist UFOs are real. It seems far more likely to my mind that UFOs are of our own devices, that we are the aliens, or at least that our creations are them. I appreciate the far more cogent, less religious, more technical, and apparently more accurate researches of Peter Levenda, Freeman Fly, etc. You see, belief in UFOs is absolutely identical to belief in God, and Cooper suffered both, to the deepest part of his soul. So beware whom you believe and follow. Yours must always be the most skeptical mind, else you are led, victim.
A lot of the reality-cone of what he “predicted” has come to pass.
It’s always been his reasons why or other specifics that have proven so hideously misguided and unsupported.