If the people committing the wrongdoing are not paying a personal(not just a paid vacation) price for it, nothing changes.
Make it from the po-po pension fund and I’m right there with ya!
In order to get the jackboot legal protections removed we would need the voting public interested and involved in the issue. If people were paying attention and active PD’s would be racing to dispose of thugs like this and then the issue would seem to be moot.
That is why in addition to being active we need to become interested not only in fixing the problem but also in retribution. We can make bad cops go away through political action but like you say we cannot keep them away without punishing them personally.