[spoilers="District 9"]
Yeah, I kind of got off-topic from plot holes to unexplained aspects. I think you are just naming possible things that COULD'VE happened, and you're guessing. I guess this movie does leave you to come up with the explanations, which isn't always a bad thing. But, again, the whole thing isn't very realistic to me. This movie kind of takes an opposite approach to the alien species, I think, because aliens are (and should be) usually portrayed as a higher order species than humans. Sci-Fi is a great genre when everything comes together, it is at least somewhat reasonable, and most plot points are explained.
[/spoilers]
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