I hardly think you can compare 90% of cyclists who dont even stop pedalling as they go through a stop sign to a motorists slowing down to 3 mph and then going.
Everytime I see a biker approaching a stop sign I hope and hope that they will stop......Im ALWAYS disapointed. I have had more cyclists get pissed off at me for stopping in front of them then I have seen cyclists stop.
Its laziness mixed with stupidity and its the single biggest thing we have going against us.