Dude.....there is a HUUUUUUUUUUUUGE difference between damaging someone's car or even defacing bumper stickers and leaving someone a note. Sorry....but you aren't going to convince me or most people that leaving a note on someone's car somehow causes irreperable harm to the vehicle. It comes down to maturity. If you feel mature enough to express a political opinion, more power to you, but be prepared to be countered on it. I would never leave the type of note that the OP refers to saying "You're an idiot", but I might leave a note pointing out the facts of why the message expressed is not entirely accurate or completely incorrect. I used to have a "George Bush is a Lesbian" bumper sticker on my car (25 years ago). I would get all kinds of notes many of which we humorous and made me laugh, several which were so completely over the top angry...which made me laugh and a slew in between. It never bothered me in the least because I kind of expected that if I expected people to read by point of view....I would open myself up to theirs. I reiterate....If you are so emotionally upset over someone posting a note on your car, perhaps expressing yourself in the bumper stickers is something you need to rethink. Its probably not worth the emotional aggravation that it causes you.