How do UFOs crash

I’ve always been interested in UFOs and I do believe that there is intelligent life elsewhere in the galaxy - possibly very close

However I find it very hard to believe that an advanced civilisation, who have crossed the endless voids of space would crash on arrival.

I mean, airliners on earth rarely crash - surely super advanced NHI wouldn’t design crafts with such faults - how does anyone explain the crashes? I’m genuinely curious.

PS - I really want to believe, it’s just questions like this make it hard for me to justify the existence of crash retrievals projects and such