Exactly what would we do if a fleet of spacecraft landed and 10,000 aliens disembarked?

Already here and there are many factions -- ones allied with the world governments are experimenting on humans cross breeding animal human alien hybrids DNA modification in underground bases

If an alien civilisation has managed to transport 10,000 members across thousands of light years, we have no hope whatsoever of blasting them into anything except possibly great laughter. The most we can do is hope they're more like ET and not Independence Day.

(IMHO if they've come this way and not immediately obliterated earthly life from orbit, they're probably not interested in hurting anyone, so it's best to try and be friends)

I just hope they wouldn't all join SW.

Think of the panic when Orson Welles radio program aired.

It was obvious fiction even then! And that changed the face of the world as people saw it.

Hit them with a departure tax