(From Bryan Caplan, on the excellent http://www.econlib.org/):
When someone drops out of high school, overeats, or fails to exercise, you tell us that their behavior is only "human." But if a conservative or libertarian objects to paying taxes to help people who make these choices, you get angry. Question: Why are you so forgiving of people with irresponsible lifestyles, but so outraged by people who don't want to pay taxes to help people with irresponsible lifestyles? This seems morally perverse. If you're going to single anyone out for condemnation, it should be the person who behaves irresponsibly in the first place, not the complete stranger who asks, "How is this my fault?"
It's tempting to insist, "We're all sinners." But the hard fact is that there's a lot of variance in the population. People with extremely responsible lifestyles are just as human as anyone else. They're not gods, just mortals who do the right thing. We should hold them up as role models, instead of attacking them if they complain that they're taxed enough already.