IMO, that whole issue was a classic misnomer.
Having taken a few marketing classes in school, the idea of introducing a new "product" has to be handled with care and not just quickly pushed out the door without giving the promotion some careful studying and thought. This Defund the Police was given the wrong branding, and as I will note below, some slanted promotional support.
I think the whole idea centered around the idea that a hammer is not best the solution to all the problems that police departments typically have to deal with. Police departments should have more diversification in their forces where even, dare I say it, "social workers" would be more appropriate to deal with certain kinds of problems. Negotiating with someone who is going through a mental crisis can be a problem for sure, especially when someone is armed. But if they can be talked off the ledge without anyone being harmed, that would be the best solution for all.
Of course, I can appreciate a patrolman's position as well when he has been called to this kind of situation and is the first responder. With all of the guns we have on the streets these days, it's just human behavior to think, if it's him or me, I know who I am choosing, and not all first responders may have this kind of training.
As far as national Democrats supporting the Defund the Police idea (as in all defunding), I doubt very few, or any for that matter, would actually fall into that category. It was the RW media who ran with that kind of thinking and it stuck.
Another part of this problem that doesn't get mentioned enough are just plain bad cops who get recycled through multiple police departments without proper vetting, as we saw in Springfield, Illinois this summer.
https://www.cnn.com/2024/07/22/us/sonya-massey-police-shooting/index.html