"They have caused more than one accident as the result of some driver changing lanes and not seeing the idiots,"
You don`t have to be an idiot for someone to change lanes into you on a motorcycle. Sometimes, its the idiot in the car that is the problem, not the person on the motorcycle. Some motorcyclist actually obey the law and are very safe on the road.
I agree with you on these "stunt bike" riders being morons though. I like putting my signal on when I see them coming up on me. That usually gets a quick hand on the brake from them.