i understand where you're coming from, but what i meant was not
to go underground and look for fights etc, but more of like in a
situation, for example, you see someone getting robbed and
threatened, instead of just only calling the police, you can make
an effort to try and disarm the person. this might save a person's
life which might have been impossible to do if no one versed in
unarmed combat is in the vicinity.
also, since there are no rules on the streets, changing the course
of the opponent is the number 1 priority, be it injuring him to
stop his course, or somehow managing to psycho him into realising
that what he is doing is not what he wants to do.