I just don't see the comparison in the craziness I see from cyclists and motorists. I know where I can go if I want to see cyclists run red lights. But I've seen dangerous road-rage fed borderline-violent behavior from motorists. Just because I slowed somebody down. Those few precious seconds are gone, and because of that we will never have a cure for cancer -- what was I thinking?
If I'm going around a blind corner, can see a car coming and some idiot is clearly going to try to pass me, I put my open hand down in the "slow" signal. I think that works less than half the time. There was one instance this year where the guy ignored me, and ran the car going the other way into the ditch. Even then there was a good likelihood for a head-on collision. I have a hard time imagining trying to pass on a blind corner much less if someone put their hand out to try to get me to slow down.