Although I don't condone the stuff, I have one incident of Bush/Cheney sign vandalism in my past. I still remember how pissed off I got at my Repug friends from high school when they were going around stealing Gore/Lieberman signs. I managed not to stoop to their level through the entire election period... but in May following the whole election/selection debacle, this one house on the outskirts of town was still proudly displaying their sign for the Chimp. Something in me snapped, so one night I went to work, and did a little vandalism of my own. I have a picture of the final result that I've attempted to post here, for the purpose of fully coming clean and because it's still funny to see, at least to me. My alteration lasted a day or so before the entire sign got knocked to the ground.
ON EDIT: Guess I should've know Angelfire wouldn't let me post it... oh well...
But anyway, that off my chest, I wanted to say that I agree with your post. I think we should respect the signs of Bush/Cheney supporters and other Repug supporters and they should respect ours.