Your foolish assumption is that there are no left wing police officers, ex-military, or law abiding gun owners. You seem to think that on the left. They're not out marching around around like the right wing thugs trying to terrorize the left, but they are most definitely there.
Every other right wing attempt to stop people from achieving their God given right to freedom and equality has failed. Slavery ended, the Klan was driven underground, lynching stopped, black people got the vote, schools were desegregated.
The murder of minorites by police will end too. But every leftist attempt to gain civil rights for citizens of your country has been met with deadly violence from the right wingers in your nation.