I never put bumper stickers on my car for any reason other than those required to park in certain lots. Other than not wanting to damage the paint, I simply don't care about what another driver's views are. I don't care about your dog's breed, the honor role student or someone else's polictical stance...so why should mine matter when we're sitting in traffic? Besides anyone's views who could be changed by something like a bumper sticker probably doesn't have strong convictions to begin with. Just my opinion.
I shoot with a lot of people I work with and we talk about guns all the time and make fun of the extremes of both sides. It doesn't bother anyone, and it it did so what....get over it.
Voting and writing politicians works far more effectively than putting some sticker on a car or wearing clothing with logos.
"And remember, Abraham Lincoln didn't die in vain, he died in Washington D.C." - Firesign Theatre