The Brown shooting in my mind and in many peoples mind was NOT justified. He shot a known unarmed victim that was already wounded and trying to flee the scene. There was no reason to shoot him down. He would eventually arrived at an ER to treat his GSW and could easily be apprehended then without incident. Police do that all the time. Instead he shot him down dead.
Also there are not just 1 or 2 incidents with the CPD or police in general. At what point do you believe it is systemic? The Rialto police, since the mayor mandated body cams, has a 50% decrease in officer involved violence against civilians. Are criminals now running rampant in Rialto more than they were before body cams? No they are not.
So how do you explain if you are black and unarmed you have a 14% chance of being shot and killed by the police. If you are hispanic and unarmed you have 10% chance and if you are white and unarmed you have a 6% chance.
Again when do this suggest a systemic problem to you?
https://www.washingtonpost.com/graphics/national/police-shootings/