I think the first thing is accountability. This is why body cameras have been a go to solution. The more visibility, the less wiggle room a cop or criminal have with the truth.
It's not a silver bullet. But the more exposure every police interaction gets the more we can absolutely establish who's right and who's wrong. I don't want cops caught in bullshit lawsuits they don't deserve either.
We need to overhaul training. Iamtdg mentioned that some cops feel like their life is threatened every day. That's insane and I think we make our officers unreasonably scared of the public they're trying to protect.
This creates a destructive cycle where cops are scared for their lives so they use more lethal force and criminals are also scared for their lives, in what becomes a self fulfilling prophesy.
We need to stop treating peacekeepers like the military. If you're supposed to maintain peace and order, do not bust into people's homes armed to the teeth to serve warrants.
How many officers have lost their lives invading people's homes like they were marines in Kabul? How many civilians have lost their lives in the terror and confusion of the invasion?