People in real trouble need help. Its up to you do decide when, if, and what help you give. Evaluate the scene right quick and make a decision. Two guys and two gals with a flat tire? I'm on down the road. They should have a cell phone and some more friends. And know how to change a tire.
An old lady? I'll stop to help, after approaching in a non-threatening manner with my hands in plain sight. My grandmother had a white handkerchief in her glovebox. If she broke down, she would tie it to the antenna and sit in her car with her hand on her little .25.
Its all a judgement call. Running up to a cop in a shootout is most likely to get me shot. By the cop or the BG. Not good. Taking out the BG with my car is an option, as stated before. Giving the LEO more cover with my car is another. Being a good witness is vital. If I can't safely stop, I'll find a place to observe and report from, in support of the operation. Deliberately walking into a gunfight is not what CHL is about, IMHO. If the officer is hit and the BG bugs out, I'll be there to get him whatever help I can.
To each his own, as long as it doesn't interfere with me or mine.....
I will respect the officer that stops me, I will be polite and professional, as I hope he/she will be. I will not make any move to escalate the situation and will be cooperative as best possible without letting my opinions get the best of me or being confrontational. If he/she wants to act like a goofball, opinionated know it all, that's fine. I won't lose my professionalism and will handle it calmly. If I file a complaint later, it will be knowing with absolute certaintly that it is justified.