Fresh out of high school on to a college campus with, the same ignorance and poorly formulated ideas and on top of that.... some college professors take an active role in positively reinforcing their stupidity.
On the flip side, I think it's dismissive to say that the people in Congress are "stupid".
They are very well educated, and have **** figured out way more than the rest of us do. They are what passes for "royalty" in American society and they know it and generally they are very effective at getting stuff done when they are of a mind to do so. Unfortunately for us, the agenda is being set by lobbyists, so the stuff that gets done doesn't serve the likes of you and I very well.