Why do ufo’s have/use lights?

Basically yeah, what’s with all the lights? There a dead giveaway. We ourselves posses ultra light sensitive cameras, we use them in the military or when filming wildlife for a bunch of reasons notably so as to not give ourselves away. You would think that a technologically advanced race would do the same if they wanted to observe/ abduct us and remain hidden. I mean, they can do a bunch of super futuristic stuff, surely they have worked that one out right?

I’m not questioning ufo’s existence, just wondering, any good theories? My brother suggested that maybe there just stupid tourist aliens that forgot to turn off there lights and that the more well behaved ufo’s go unnoticed. That would explain some of the erratic flying patterns and crashes. Basically “rich kids” and there toys. Seams kinda diminishing to just chalk it all up to negligence or design flaw.