>>64262561
First of all, "alien" could mean a lot of things but it is a loaded word with science fiction connotations. It's better to say that they are non human intelligence or unknowns, since we don't really know what they are or where they come from.
Secondly, you are again inferring science fiction narratives to suggest they flew here from another planet. We know from physics that theoretically it's possible they bent space/time or are interdimensional in nature and travel in ways we don't fully understand. The notion that because we can't travel that way somehow means that other significantly advanced species couldn't is incredibly short sighted.
Third, any manufactured technology is going to fail at some point, even extremely advanced technology needs maintenance and could fail. It isn't magic even though it may appear to be. Crashes by these objects lends credence to the reports that there are way more of them operating here than we realize.
Reports of these unidentified objects predates WW2. And if you take into account stories of monsters and demons in antiquity being misidentified NHIs then we've been in contact with them a very long time. Not that the ancient alien theorists are correct, just that the notion that these creatures showed up in 1947 is likely false.
And finally, humans tend to compartmentalize things they don't understand and fear. They laugh at them and mock them to cope. They attack people who take the unknown seriously. Skeptics are just as bad as true believers who think that everything is aliens. Both sides fit everything into their world view and ignore evidence to the contrary. That's not how science is supposed to work.
