Of course I do.
People overstate just how "otherworldly" aliens are. First off, statistically there is almost a certainty that aliens exist, and intelligent life, even if phenomenally rare, must have evolved somewhere else because nothing happens in a void. If it happened here it can theoretically happen almost anywhere, for obvious reasons (e.g., the laws of physics are identical across the universe so anything happening here must, by definition, be just as possible anywhere else under similar circumstances).
And interstellar travel requires only a large supply of antimatter and the willingness to spend years traveling between systems at relativistic speed. Many, many, many physicists and scientists on Earth have already drawn up a multitude of ways to build antimatter rockets for this very reason and any one of them is equally plausible, given a sufficient technology base...and that only requires they're a few thousand or tens of thousands of years older than we are, or got lucky.
In my opinion, people don't want to accept the possibility of alien life and by extension visitation, because it IS admittedly scary to admit that not only are we not alone but our roommates happy to be hundreds or thousands of years more advanced than us. But from a realistic standpoint nothing makes alien life or visitation "impossible" or even "improbable". Indeed the only improbable thing is that we're alone in the universe, or that every other possible species is completely non-intelligent. It's wishful thinking by people who don't want their apple cart upended.
And there's nothing WRONG with that. But let's not pretend that this is something so bizarre and alien when in fact, scientists on Earth already have drawn up designs for interstellar arks and spacecraft and our civilization only gained space travel a few decades ago. In fact we had realistic designs for nuclear powered spacecraft on the table in the 60s, when they were talking about high-end estimates being ships the size of skyscrapers capable of traveling at nearly 80% of light-speed, IN THE SIXTIES. (no bullshit, look up "Orion Drive") A race a few hundred or thousand years older could easily have built more sophisticated designs--or not, the Orion designs were perfectly serviceable. Oh and yeah, they did kind of look like the spaceships people claim to see...so yeah...aliens exist.
