I am conscious of your original meme, and aside from my initial snark, I'm not that keen to butt heads over it.
I DON'T agree with your reasoning, though: Black Lives Matter was very specifically set up to address police violence, which - frankly - I'm white and have a clean record, and the cops still terrify me sometimes. That's a very serious issue. Good guys shouldn't have to fear the police, ever.
Common criminals - murderers, what have you - OK, we don't want them in society, BUT nobody trusted them with a badge to begin with. Nobody invested responsibility to them through the state - OUR state, OUR government. They didn't breach that trust - we didn't GIVE them any trust to begin with. THAT'S the difference: your two cases are not equivalent, and common crime is not BLM's chosen fight (there are MANY black-run movements that DO specifically deal with black-on-black crime).
That's all I have the energy to say tonight, so, I'll tell you what: if you do make a counter-argument, I'll take the time to read it and think about it - but I'm having a bad night, so I'll likely leave you with the last word until some other time.