story goes, if you leave them alone, the will leave you alone
Experiences? I could name a few, forget about what you've seen on the news or 'sons of anarchy'
Bikers generally get on with their lifes, a 'patch' club is like a brotherhood and its one of those things, if you don't know about it, you wouldn't understand anyway.
I my experience, certainly all the bikers I know or have dealt with, both patch clubs (Hells Angels, Outlaws etc etc) are generally decent human beings who look after their own, and deal with their own issues in their own way.