I really want to see this movie. But when I was watching the commercial for it, and the alien was being interrogated, I felt bad for the alien. The people interrogating it said "how do your weapons work?" and the alien said "we just want to go home." I don't know why I'm obsessing over that, but I felt really bad for the alien.
Basically the way I understood the plot was that they came here with far advanced technology and we forced them to stay so we could stal it from them. I might be mistaken, but either way I'm very excited to see it.
Doesn't a lot of the plot revol around the fact that some humans sympathise with the aliens and it's illegal too?
No, if you look on wikipedia there's a plot summary.
[SPOILERS]
Apparently there's a guy who gets sprayed with something that could transform him into a non-human and he tries to find the cure for most of the movie.