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If you say "We're going to have a special mental health response team to deal with suicidal people and the non-violent mentally ill." Who would oppose that?A lot of people! One of the standard arguments is, mentally ill people are by definition unpredictable, so you can't classify then as "non-violent," so all responders must be armed and trained in the use of force for at least their own protection if not the protection of others.
Note that this is the actual argument as to why traffic cops are armed in the US. Erratic drivers are considered unpredictable, and anyone in the US could easily have a gun, so there isn't a special team for handling "non-violent" traffic offenders. It's the regular cops with their regular authorization to use deadly force.
Or put another way - if it were such an obviously good idea to the whole political spectrum, why hasn't it happened before?
"The police are racist murderers" is, first of all, objectively true and facts don't care about your feelings, but more importantly, it's objectively better rhetoric. Problems with inappropriate police responses have been around for a long while - and, unsurprisingly, they affect whites too (Ryan Whitaker was killed by officers investigating a noise complaint, and six-year-old Jeremy Mardis was killed by officers after chasing the car he was in the back seat of). But there hasn't been any real movement to change things.
Meanwhile, a whole lot of local governments are making good and meaningful changes thanks to people saying things like "The police are racist murderers" and "Defund the police." So while you may not like the slogans, they definitely seem to be working.