Take a group of people in any country and you'll find many of the same characteristics that are found in others. You can't expect to select people for the police departments who have absolutely zero opinions on various issues, including people of different races. If they don't have these opinions when they join, they will later. Look at how some segments of the population deal with the police- they hate anyone in uniform, are willing to fight to the death when confronted by them & want them dead and refuse to give information about the stupid number of crimes because "Snitches get stitches". These are the same ones who wail and cry when a family member or someone they know is killed- the first thing they ask is "Where were the police? They should have stopped this!".
How many Black people do you know and how many have you interacted with? If it's not more than several hundreds, don't tell anyone how to think about them or anything about them. I'm not writing this as a comment about Blacks, it's a comment about people who don't have direct experience about what they're telling others. As bad as the problems are, the practice of stopping people for minor traffic offenses results in a huge number of arrests for more serious crimes. The fact is, it gets criminals off of the streets. Conversely, Blacks often don't trust each other, either. As a former neighbor said, "Blacks fall all over themselves trying to screw each other and when someone who actually wants to help comes along, they aren't trusted, either". George is Black. He has huge problems with the way Blacks are screwing themselves. I went to WalMart yesterday and as I was on my way out, the people who check receipts to see if they match what's in the bags stopped several Black people, yet they let me go without any question. Occasionally, I need to show my receipt, but it's rare and most of the people working there are Black. That store also has a huge problem with shoplifting and guess who's doing it?
Ever had someone spit in your face? The Police have to deal with that on a regular basis. Imagine that you want to try to do your job and have people fight with you, try to take your weapon, attempt to drive over you, shoot at you, throw rocks/bottles/bricks at you and you're in the area because you're trying to gather information about a crime against someone who lives there. You're there to help, but some want to hurt you. How long before you adopt a "Why bother?" attitude?
Now, imagine that you went there to fight a fire or you's an EMT. People shoot at them, too. They can't even go into a crime scene to save lives until the police clear the area and when that's required, people die. I have NEVER heard of that happening in any area where the population is very diverse.
Statistics don't lie, but they can be skewed. We can't profile for terrorists because it's not politically correct, but it would result in stopping more events. Stopping people for "driving while Black" and the "Broken windows" polices work, period.
Laws are ignored every second of every day. How long can we, as a society, accept that?