This is going to be an unpopular opinion, but here goes;
Payne Haas acted like an idiot, what he said was ugly and repugnant and he shouldn't have done it.
I don't however think it should be made into something bigger than what it was.
He was minding his own business, by all accounts having a heavily emotional discussion with his partner when approached by "many" police. Given his family history, he likely felt targeted, being quoted that he repeatedly suggested they taser him suggests he also felt threatened, and like an idiot behaved in a threatening manner as well/in response?.
Across the experiences I've seen, I'd be surprised if the police behaved absolutely perfect (not that that excuses his behaviour). Nevertheless, the whole thing was quoted as being about 3 minutes long. He apologised soon after, then later also went down on his own volition to apologise to the police and go through what he did.
He hasn't tried to deflect any responsibility for the event and has pleaded guilty and taken it completely on the chin. He's faced natural justice and has been recorded without conviction (as agreed to by the police/prosecutors).
It clearly wasn't his decision for the text to be published in the media, and he has apologised unreservedly and in totality. At the end of the day they were really shitty words in a private setting without any physical actions on his part.
I personally think the media releasing those words is potentially more damaging than the entire event, but it is what it is.