Do people give rude answers only to make them feel better?

I feel if someone can't think of a way to express their thoughts without being rude, it says more about their mentality and their character than they can ever say about you, so either delete the rude ones or ignore them. If you can't do that, cut them off at the knees by putting them in their place, in the most polite and mature way possible, showing them up as idiots. There is so much disdain that can be expressed in a few well worded, courteous sentences.