There's two sides to every story. And every business/organization has bad apples. Achieving perfection becomes order of magnitudes more expensive the closer you are to achieving it, so some level of acceptance that factors economic cost must be reached. The police are humans too. Knowing people are throwing Molotov Cocktails and bricks at police cars, I wouldn't sit still in my car if people, I mean, a mob (mentality…
You know where the expression "bad apples" came from, right? A few bad apples spoil the bunch. In other words, if there are a couple of rotten apples in a barrel, it spreads quickly to the whole barrel. In other words, it's important to find and throw out the bad apples immediately or you'll have to throw out the whole barrel a few days later.
And, in organizations, change comes from the top. As I said, reaching perfection is prohibitively expensive.