Typing out long winded posts is great, but using human logic on things that very well may be out of our scope of comprehension is just ignorant.
Human logic is different from the kind of logic other sentient beings would use ? And if "human logic" is insufficient to argue against why aliens would be able to visit Earth, then can it not be said that human logic is insufficient to argue for why aliens would be able to visit Earth ?
And could what you are saying not be applied to other things as well. Even if we are quite positively certain using modern physics that the law of conservation of energy is a true law, could our "human logic" just not be able to comprehend it despite various tests all leading to the same conclusion, and could not some alien be the creator of all things, or perhaps there are aliens who would wish to destroy all energy and matter.
If we start to ignore the brilliance of our own species and look at laws which will always end with the same result no matter how many times they are tested, then we can go pretty much anywhere with theories about the world until we start believing there is such a thing as magic. Yes, I know the phrase "any sufficiently advanced technology is indistinguishable from magic" but there is a point where it just becomes silly. No technology can make one plus one not equal to two, and no technology can break laws of physics which we can and have tested many times always leading to the same conclusions.
Now I'm a strong believer in alien life somewhere out there, this world is just too wast for there not to be another hospitable planet such as this one somewhere else. However I won't ever start to think other sentient beings could perform feats which we humans have already proven to be impossible to perform.