I agree with what BowtechBen has said.Funny to think it not funny or right to do it.I have never understood why people use their vehicles as bill boards to express their political or personal beliefs,maybe as a salesperson I have always wanted to make sure that something I could control wouldn't sway a customers or prospective customers ability to relate to me.How often are we following a car with particular bumper stickers on it and we start to form opinions about the person driving the car? I know I have a certain sense of agitation when I see the Meat is murder stickers or any other anti-hunting type stickers.
Any way again while it brought a smile to my face it is not the right thing to do,this person may have gone from slightly involved in anti hunting activism to passionately involved as a result of something like that.