Guh, but we've done the whole thing so. many. times. Japanese internment, South African apartheid, US vagrant laws, etc.
Our fears have *never* been justified.
I suppose the movie had the effect of causing people to sympathize with the folks who came up with that sort of nonsense for better or worse, I don't know. Didn't work for me. Too bad.
Which is again a broken metaphor. I'm pointing out that the whole attitude the local security types take towards the prawns (with the exception of their leader, who's just a prick), is totally justified. The prawns really
are that dangerous (excepting why the **** they had a SAM launcher unless it was to keep people out). They can kill a human nearly instantly with just bare hands, so the level of force the local security types are employing against them is, unfortunately, justified.
Integration of a group like the prawns isn't, in the strictest sense, possible. You'll end up with two sets of laws, not one, or maybe three sets of laws or four sets of laws. They will never be fully integrated. Whether he has feelings like you or me isn't really germane to the fact he can backhand me across the face and I'm not going to have a head anymore.
So yes, they could have done better about integration, but on the other hand the movie isn't just "apartheid/racism is bad" like you want to paint it; it presents a deeper, more complex issue than that, though it may not have intended to.