I didn’t happen to see the shooting of the Thug Micheal Brown to know whether his shooting was justified or not.
I did see a video of tha same thug assaulting a shop owner who was trying to prevent that same thug from stealing his property.
Therefore seeing that the Thug was stupid enough to assault a shop owner I believe he was also stupid enough to assault a police officer and try and grab his weapon.
The fellow was a very large young man. Such fellows, if not terribly bright, can get a sense of their own omnipotence. After all, everyone else they ever got into a scrape with fell down or ran away.