I'm not sure if you're directing that at me, or the parent comment. But I'm not a fringe theorist, and I don't believe that aliens have been crashing into Earth either. I find the parent comment's argument very unconvincing.
It makes assumptions which don't seem reasonable in the context of the subject matter at hand. If aliens did exist, they could be much more numerous than humans. Their spacecraft could be more dangerous than airplanes to operate. Their method of travel could perhaps result in collisions with Earth even if it wasn't their intended destination.
My overall point is that we should minimize the assumptions we make here. There's no point in assuming various things and then proposing arguments based on those predicates.
It makes assumptions which don't seem reasonable in the context of the subject matter at hand. If aliens did exist, they could be much more numerous than humans. Their spacecraft could be more dangerous than airplanes to operate. Their method of travel could perhaps result in collisions with Earth even if it wasn't their intended destination.
My overall point is that we should minimize the assumptions we make here. There's no point in assuming various things and then proposing arguments based on those predicates.