First contact with aliens could end in colonization and genocide...

 https://theconversation.com/first-contact-with-aliens-could-end-in-colonization-and-genocide-if-we-dont-learn-from-history-207793

The ET phenomenon has been around for a very long time.

https://desertshapes.blogspot.com/search?q=ET+Crash+Retrievals Could some vehiclels be like a Trojan_Horse?