"People fought and died for your right to vote!"
Of all the chestnuts, I feel like this is the one most likely to get me shot when I respond to it. I usually say something like I don't recall asking those people to fight for me, or They chose to fight, nobody forced them to. Your response is probably a bit safer :)
I don't know. It's always possible to go straight Godwin's Law, too. "Nazi soldiers fought and died for Hitler. Does that make fascism sacred, too?"
lol yeah, might as well dive right in with Hitler since he'll inevitably come up at some point anyway :D
Nah, wait for them to say, "you know who else didn't like democracy? HITLER!" I have seen this happen.
Well if they go there, just counter with something about how Jesus was an extremist zealot hellbent on overthrowing the government and establishing his own monotheistic monarchy :)