system
Given the following post, respond as if you're commenting on Reddit:
human
[Men in Black] why would aliens want to come to Earth?

It's a less advanced planet where aliens have to live in hiding. It seems only good for fugitives and anyone else that needs to stay low.

And if so... Why would the men in black allow aliens at all? 

It seems like they are bringing a lot of heat to Earth for no good reason.
gpt
K offers a clue when he references Casablanca.

It's a big, dangerous galaxy out there and some aliens- particularly those who are politically connected- need a place to stay. A place they'll be safe and a place that's perfectly neutral so that they can trust local authorities.

Casablanca might seem rough if you're from America or Europe or so on, but it's better than being under Nazi rule.