This is a bit of a controversial topic that's surely bigger than this thread, but I'm going to leave it here anyway for other people reading this.
You talk about trailer parks/low income families vs rich families, but I think that Idiocracy is not about income, it's about being dumb. Part of which is just cultural (ignorance), but part of it seems to be intelligence. And as far as I know, there's no evidence that any kid can become as intelligent as anyone else with proper raising and education. Research seems to pretty clearly show that IQ is heritable to a significant degree, and while it can be needlessly lowered in many ways (like malnutrition or high stress in critical development phases), in the absence of these issues no enrichment is able to raise it.
Despite how controversial it is in some circles, the Wikipedia article on the topic seems to be pretty good.
However, since the movie really is not deep, it's possible that its whole point was just that the idiocy is cultural, and in that case the above obviously doesn't apply. I'm just saying what it seemed like to me.
Palestine as a country has never existed and Jews have as much of a historical claim to the regions as Palestinians do.