The evidence of aliens visiting Earth is flimsy at best, so let's not abandon logic and look at what we haven't found.
Millions or is it Billions are spent looking for alien life forms and so far they have found nothing. Yes we have found a few planets which can support life, but that doesn't immediately mean they contain intelligent life able to travel the Universe.
And it's not like we're not looking.
https://www.google.com/search?source...60.UhbPx6oLMFE
And
https://www.google.com/search?ei=aC0...60.sgNZx7jSTzA
So far all they say is we need to spend more, because what we have has found nothing.
So far Homo Sapiens have been on Earth 500,000 years give or take. It was only in the last century we were able to fly in a powered craft.
https://www.livescience.com/32436-wh...on-to-fly.html
And only thelast 50 odd years we were able to develop space flight on a limited scale.
https://en.wikipedia.org/wiki/Human_spaceflight
We haven't been back to the Moon because there's no reason to.
https://en.wikipedia.org/wiki/Apollo_11
Then there's the logical approach to the problems of travelling light years across space. Unless they have come up with a way to bend the distance into nothing much, the problems are huge. A few years in 0 gravity does horrible things to your body, anyone who has suffered a bad accident that requires months laid up will verify this. Yes alien life has to have gravity. So even putting someone to sleep for a year does horrible things to your muscles.
Then there's the problem of life support systems. Building a space craft that can carry a few beings requires a huge amount of life support, so the craft we have called UFOs are incapable of carrying life forms across space. Don't tell me the Mother ship was hiding behind the Moon and sending out spotter craft, without evidence.
The investment required is so big we can't contemplate with a logical mind affording space travel out of our solar system, because producing the funds cripples the Earth, kills it off as a planet and we die out.
So why would some species develop a technology to travel across many trillions of miles other than to exploit resource they are or have run out of? The nearest star, which doesn't contain life, is 25.67 trillion miles away. The nearest habitable planet, possibly, is 72 trillion miles away. Travelling to Mars means covering a distance of 33.9 million miles. Now imagine travelling 1,000 times that.
Taking the word of someone whose wages rely on further investigation!!! Isn't the best endorsement. Suspending logic takes you to the world of movies like Interstellar, Star Wars, Star Trek, The Hitchhiker's Guide to the Galaxy. etc. I''ll stick with logic until someone proves me wrong.