I'ma just throw this out there.
Cops are a paramilitary, occupation force that operates in and out of uniform and has zero regard for rules of engagement, transparency, accountability, or any substantive consequence for up to and including national-scale human rights violations and crimes against humanity. They're not a legitimate peacekeeping force, they're domestic terrorists with badges.
As far as I'm concerned, when the cops started taking off the badges and patches to kidnap people off the street without probable cause, kept tear gassing people in jurisdictions with tear gas bans, and started openly collaborating with violent right-wing extremists, they are and should be considered nothing less than terrorists. Fuck 'em, they're fair game and if this were a just country the National Guard should be in the streets gunning them down like the rabid, corrupt, neo-fascist animals they are for what they're doing, not standing with them.
When cops stop engaging in mass chemical warfare, bare minimum, then we can have a conversation about whether guerrilla warfare is an ethically justified resistance tactic.