It sounds like you all think it was the bicyclist's fault that the drivers, in all six cases, did not stop at the stop signs.  How can drivers yield to a pedestrian or biker, dismounted or not, if they do not see ped/biker because they are blowing thru the stop sign and only looking to their left?  I take responsibility for my safety by not trusting drivers to follow the traffic laws.  Every day I see drivers running red lights and stop signs.