If you see a single restaurant chain use horrible ingredients for humans, trans fats, far too many preservatives, high fructose corn syrup, over and over, you should never eat there again. I've personally cut out mcdonalds, and the fast food garbage restaurants. It doesn't mean every restaurant is bad, it means some restaurant models are bad. I still eat shawarma, I still eat indian and thai, and my family still owns an italian restaurant where we also don't try to poison our customers with horrible ingredients.
If you're comparing police to restaurants, then let me ask you, then on a scale of Taco Bell to El Buli, where does the current american system police system lie on the scale? I'd argue it's more like at the dumpster outside of your local mcdonalds.