the danger with the "Defund the Police" movement is not that police forces will actually be dissolved.
Rather, it is that both R's and D's will respond to the "Defund the Police" lunacy by demanding more technological surveillance and tracking of people. Cameras, apps, and robots for law enforcement will be pushed as a way to keep costs down, keep bias out of policing (never heard of a racist robot, right?), and improve public safety.
It's all just Hegelian dialectical bullshit, but they wouldn't run with it if it didn't work.