Fine. So if we are going to talk about policy then we can have different points of view about policy.
A difference of view would imply disagreements over a particular gun law or reform idea, not multitudes of angry posts that demand nothing should be done. I've made the analogy of a person who goes into police reform threads and repeated posts #AllLivesMatter and dismiss all arguments against reform. That's basically what is going on in these threads all the time.
As for the moral judgment as to when oppression has reached the level that armed revolt is necessary and morally justified, I am sure philosophers have discussed that. I would assume that decision must be made by the oppressed as to when it is time to fight. I don't presume to tell black people or anyone else when that point is.
You're still dodging the question. How many murders of police officers by black youths do you feel is necessary here? If you honestly have no clue what the line is, then there's no argument to be made here. This becomes another deflection tactic to ignore the reality of the problem we're facing right now.