Critical Thinking

Since it is obivious that critical thinking is so important to teens decision making, then why is it not taught at the highschool level? As teens venture into college they have the oppurtunity to take critical thinking classes. And also it is clear that this Culture of Stupidity decreases in popularity in later college years. Is that because in college these teens learn how to analize these films to better understand that these portrayals they see are just fiction? So my queston is why are these critical thinking skill not better taught at the highschool level, since it is that age groop in which this problem is most prevalent.