If these movements want to be taken seriously, a good place to start would be for the people involved in the police 'mistreatment' to not be criminals, thugs, or hooligans.
History suggests that scope of the rights you currently enjoy were vindicated during the prosecution of criminals. That's why you have miranda rights and why confessions that are rubber hosed out of you at the police station are not admissible.
Besides that, it turns out that lots of people (you excepted) see something particularly tragic in a 12 year old having his life snuffed out a couple of seconds after the police show up. A 12 year old with a toy gun isn't a hooligan of any note.
I accept that you, personally, don't give a crap about the lives of black people who are selling cigarettes illegally, but that tradeoff of life vs property is one of the issues in 'Black lives matter'.
BLM protests do indeed fall on your deaf ears, but who gives a crap what you think.
Edited by NoNukes, : No reason given.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
History will have to record that the greatest tragedy of this period of social transition was not the strident clamor of the bad people, but the appalling silence of the good people. Martin Luther King
If there are no stupid questions, then what kind of questions do stupid people ask? Do they get smart just in time to ask questions? Scott Adams