That may be something that comes from it, but it really is about people that have been taking it in the shorts for decades, and have felt completely powerless (by design) to affect it. The "defund" thing is a blunt instrument that they hope would work; more as leverage to effect change, than anything else.
Of course, there are anarchists, who want all restraint removed from society. Those types of folks can usually be found in The Darwin Awards.
The rich are just really good at leveraging anything to their advantage, and have the tools to do it. They'll usually come out on top; regardless of what happens.
It's just that nowadays, "The Rich" includes a lot of young folks that look a lot like their employees. It isn't just a bunch of old robber barons with handlebars and muttonchops, anymore.
Also, I think I've figured out what the "defund the police" movement is really about; it's to allow Corporations to later step in and privatize the police force. Then they can claim the credit for restoring law and order and further gain people's trust whilst gaining more control over them. Seems kind of far fetched still, but few things would surprise me these days.