This is an argument often replayed on BF. I agree with the argument that unsafe driving is far more dangerous than unsafe biking, and therefore motorists should face stiffer enforcement than cyclists. However, that is merely a personal philosophy which allows me, a motorist who ALWAYS stops at ALL stop signs, to also be a cyclist who often runs them with impunity, and yet feel no guilt over that. The rule of law, unfortunately, means that laws get enforced whether they agree with our personal philosophy or not. So you just shrug, pay the fine, and make sure you look around for cops when you get to that particular stop sign from now on. Not much else you can do.