I typically avoid these conversations, too, but sometimes they come up and really aren't avoidable. If after a good chunk of time and debating they are still hurling the standard liberal retorts (you know, the whole "think of the children" type spew), then I am going to start ending the convo with this: "You know what, unlike you I support the Bill of Rights so I will support your right to free speech, but remember this: without the 2nd amendment you wouldn't have the 1st" (bumper stickers ftw).