Well some people have a conscience and some don't.
I do have a conscience. In fact I am probably more sociably responsible than you may think or gather from my posts on this board.
The difference is I can seperate myself from self imposed situations and their consequences.
If a rider were riding and went down and I saw it happen or was first on scene I would stop, call 911 and administer what help I could until help arrived.
If some dipshit blew past me weaving traffic and cutting off cars and then got into an accident then he was playing the odds and lost. It no longer is my concern because he gambled and lost and Darwin took what was his anyways.
I've seen people die in front of me, and I will not put myself through watching it again if it is a result of their own stupidity, because saving them now just means someone else will have to do it again at another point in life and it isn't fair to anyone involved.