Wilson was given the chance to resign. I imagine the paid him pretty well to just go away.
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He was certainly not safe in Ferguson nor capable of maintaining the respect that a cop needs to do his job.
Had he not resigned, he would have been canned. There was an extensive article about him in the New Yorker.
I have to look that up, the New Yorker is pretty good about digging up details.
It is true that a policeman needs respect, that he got attacked on that occasion shows how wrong a lack of respect can go. Of course it was the disrespectful guy who died this time, but it can be the other way.
Almost was.
I don't see what this officer did that excused his attacker or implies any incompetence on the officers part.