Didn't that just (roughly) describe a bell curve? And isn't 20% of cops being horrible people way too much? Less than one standard deviation away from the norm and you're already in "make up fake drugs charges" territory?

Did the article talk about what the 60% do about the 20% who are horrible? This is the question that tends to be avoided in discussions that take this line or similar ones. If those numbers are accurate, the majority of average cops outnumber the horrible ones 3:1 and also have the 20% of excellent cops to refer to as examples. I think that's a more useful framing than one which positions the majority of cops as victims of "the day or the culture of their department or other circumstances".