Having eyewitnessed some strange flying things, I’m not going to call them liars.
But the timing says “squirrel” to me.
All that said, there are all sorts of reasons aliens could be crashing:
1. Interstellar transport does not mean slower-than-light transport is much better than what we have. Physics are physics.
2. They could be stuck here with degrading equipment. Maybe for a long time.
3. They’re morons.
4. They’re fighting each other.
5. They’re smugglers and got shot down by alien cops.
6. They’re some alien college researchers on a shoe string budget with crap equipment.
7. Etc.
“We were trying out the new self-flying mode in our Setla flying saucer and it drove us here. Where the h*ll are we?”
Funny!!!
All of the above..................