I will stop and offer assistance if there is no emergengy workers on scene or if it is MCI and only 1 unit, other than that I keep driving.
About professionalism, I haven't much to say, some scenes I was treated like"Ricky Rescue" and others I was a valued pair of hands. But someone once told me "Be careful about the toes you step on today, they may be connected to the ass you have to kiss tommorrow."
my $0.02,
Joe