If you were drunk, and grabbed at a police officers gun because of a stupid drunken action, you're saying it's perfectly ok for that officer to execute you?
There were more options available to those officers, the officer for whom allegedly had the man reach for his weapon specifically, made the wrong decisions.
Yeah of course there were other options. In that video ThestigGT999 posted, the news anchor made the valid point that when the man reached for the officers gun, all the officer had to do was stand up. There were 4 other officers there all able to restrain this guy.
If this had taken place in the UK, the police would have ended up with this man in custardy, and probably unharmed. In America though with their gun culture, it seems to be shoot first and ask questions later. Even worse is that the American police appear to be immune from reprisals for their heavy handed approach.