The American system of education, as it presently stands, is not educating but insuring that kids become even dumber than they already are.
As the comedian says, "You can't fix stupid," and it is true for some posting on this thread.
Genes make people stupid and attending a good or bad school won't change that.
How about using the word ignorant?
And again, substituting ignorant for stupid may not help much. To be helped you must reconize your ignorance in certain subjects and be willing to change that.
Read the bumper stickers. Teenagers know everything. They will deny their own ignorance until the cows come home leaving little chance of improvement.
Also to add, in all my years, I've seen teachers handing out information to lessen the level of ignorance and I've seen thousands of students fight those teachers to continue living in ignorance.
Unlike the crap you hear and read, students aren't begging teachers for knowledge while the teachers are ignoring their requests.
Society can punish and bad-mouth the teaching profession all it wants, but until we can convince the ignorant that they are indeed ignorant and only paying attention and learning will correct this, nothing academically will change.