It's not. The goal is to demand equal protections under the law for all, eliminate racial bias in policing, judging and sentencing, and make police themselves follow the law.
Don't be misled by the "defund police" mantra. It's just a way to divert resources to community engagement programs and/or get out of contracts with police unions. It doesn't literally mean "shut down the police department and courts".
> From my limited understanding of this position
At least you're honest about it. I'd encourage you to educate yourself instead of just relying on soundbites and scare-mongering media headlines (not saying that's what you've been doing so far).