The whole movie seemed to be a cheap dig on stereotypes of rural/redneck behavior rather than any meaningful look at society. The conclusion that it hand-holds the audience is that the "wrong" kind of Americans don't respect intellectuals enough and they will ruin the country. The movie literally ends by the educated savior being respected for being smart.
I don't agree with your indictment of satire in general; I consider Idiocracy to be pretty ham-fisted in that regard. Especially compared to much better Mike Judge works like Office Space and Silicon Valley.