Fermi Paradox. Are there aliens? Of course. Are they in our current time and local space? Probably not. It's it fun to think about? Yes, that's why science fiction exists.
More importantly, are they a lifeforms that we would even recognize as alive? The chances of an alien being humanoid are even slimmer. Then there's whether they develop intelligence, whether they care about space, and whether they survive long enough to get anywhere.
If intelligent life exists anywhere else the biggest chance we have of finding anything would be a self sustaining vehicle sent off into space by them at some point. The chances of us being alive at the same time in close enough proximity to encounter each other is almost zero.
If a vessel could wander space endlessly we have a slightly bigger (but still almost zero) chance of encountering it.
Counterpoint, why do dolphins and sharks look so alike when they have a completely different phylogenetic tree? They separately developed traits that were very well suited to the medium of water. Convergent evolution means that it isn't entirely unlikely that whatever we may find has similar traits to beings on earth, because we all exist in a universe of solids, liquids, and gasses.
It's a fair point, but I guess we would recognise them, especially if carbon-based.
Think of another issue. We evolved in 6 million years. Assuming it takes 4 billion for the planet to form and organisms to form, that means there's 8 bln years where civ can start. What's the chance that they are at a similar tech level as us? Really small.
I suspect the same with Area 51. They used aliens to cover up even worse stuff. Like torture techniques, biological weapons and other stuff banned by international accords like the Geneva convention.
They were covering up the news about the ocean srreams possibly dying by 2025. They did it to cover up the news that they're officially destroying the planet.
You do realize the media could run a week straight of news about ocean currents dying and half the population would challenge whether or not we even have or need ocean currents.
Ocean "currents"? I ain't never seen no goddamn "currents" in the ocean, boy. Have you? They just be sayin' these things to keep us distracted from how their undloadin' trucks full of illegals in are country to steal are jobs and sell drugs and live off of welfare!