I'm not going to hold forth about the situation. I wasn't there. "Things went terribly wrong," is about the best I have. That's no comfort at all for the man's survivors and does nothing to fix matters for them. Nor does it provide a guideline for police retraining. Two nervous people interacted and one of them was killed as a result. It wasn't the policeman.
Do what you can to manage your encounters with the police. The officer is well-armed, has backup and works under qualified immunity; courts will tend to defer to his or her opinion. You? You're just some gal or some guy. Oh, probably a citizen, and you like to think of yourself as a good citizen. When Officer Friendly stopped you, awarding a Good Citizenship medal was probably not the reason. So you're already behind the eight-ball, more so if you're visibly off the average, and who isn't? Play it cool.
- Minimize the reasons you might be stopped. All vehicle lights working, no big obvious cracks in the windshield, obey speed limits, etc. (I do badly at this -- I have a sidelight that needs fixed and, typical city-dweller, I'm an habitual flow-of-traffic speeder.)
- A police stop is probably not the time to engage in political protest. Unless you were setting out to make a point, maybe get some bad policy or law challenged in court, concentrate on what you need to do to get through the experience unscathed. Is this humiliating? Is it something no decent citizen of a democracy ought to have to endure? Probably -- but there you are. Do you want to sleep in your own bed that night? The alternatives are a thin mattress at the jail or a cold slab at the morgue. They suck.
- If you are stopped, engine off (if driving) and no sudden moves. Do only what the officer tells you, offer only the information requested and remember the stakes: your life and freedom.
Stay alive, stay out of jail, and write your Congressthing. Write your state-level representatives. Call 'em up. Let your local government know when they or theirs are getting over the line. And help prevent the next police encounter gone wrong.