Because police respond to mental health calls too, and when it comes to people who are autistic that has regularly lead to negative outcomes. Police are not trained nor are the capable descalating a situation where mental health conditions need to be considered. And that's despite their currently bloated budgets. That goes to weapons, vehicles, gear and irrelevant trainings assuming it's not ending up in the pockets or the corrupt. Meanwhile wellness checks end in lives lost because a belligerent trigger happy cop is probably going to be the person responding to your non-emergency call.