Technology

If actual aliens are here it basically means travelling faster than light is possible.

Not just possible, but dirt cheap, otherwise why would they be constantly dropping down into Earth to see what we're up to.

Really, the whole notion is a bit silly when you think about it rationally. If a society was advanced to the point of cheap FTL (which, I feel the need to point out, isn't just "advanced technology" but "technology that operates in complete defiance to our most fundamental understandings of physics"), why on earth would they be dipping into the actual atmosphere, doing landings, or flying by private aircraft? Surely a society with such breathtaking technology could drop a single spy satellite into orbit and get every piece of info they could possibly want about us, especially now that we're in the digital age.

I have no doubt that alien life of some sort is out there, very possibly it's even prolific (though that doesn't seem to be the case based on our admittedly limited observations of exoplanets), but there's no rational basis for thinking that an advanced alien society would have either the means, nor the motivation, to constantly pop down to earth to screw with pilots, farmers, etc.