You repeatedly characterize police as an institution that "serve[s] as a means of maintaining the race, gender, and class hierarchy of an oppressive society".
But you don't explain what it is about the police that forces it to be this way, rather than being reformable in ways that can make it not-this-way.
Perhaps there's an argument to be made that the reforms are too difficult. But structural inequality is a mechanism, not magic that taints things without cause or reason, like cooties.
If you don't address the mechanisms, you don't understand the phenomenon. And if you don't understand the phenomenon, how can you even replace it with something different (or throw it away entirely) and know you won't get the same result or one which is even worse?
The impact on people is too great and too cruel to succumb to magical thinking. Let's understand the reasoning and evidence so we can devise a wise, compassionate, and ethical strategy.