A common argument against aliens visiting earth is that travel between stars is impossible because of the long distance and speed of light barrier
This argument is fallacious. We have no idea whether faster than light travel is impossible, or whether or not there is some way to circumvent space thru wormholes or something like that. We simply do not know how it could be possible
I'm not saying it IS possible, I'm saying we dont know either way
If you're up on modern physics you know that our current knowledge of how the universe works is extremely limited, we really have no idea what Black Holes are or how they work, we dont know how subatomic particles work, I think there's something like 11 competing theories of physics right now that seek to explain them and none of them are faring well against ongoing research
Again I'm not saying aliens do or could visit earth, but dogmatically saying its impossible is not "skeptical" but a dogmatic position following from faulty assumptions. An older an more technologically advanced species may well have figured these things out