Exactly, I've seen for a long time that cops have the most toxic online forums. I mean, I've felt that they're often as bad or worse than the Neo-Nazi ones I've come across. But how do you know that these are real cops, and how representative are they of the force? Proper study shows that they are real cops, many of them are of higher rank in their departments, they make it hard for their coworkers to be treated with respect, they disproportionately harm civilians, and they cost their municipalities tons of money.
When you have enough evidence one way or the other then you can begin addressing the problem properly.
Evidence lead policies are the most rational way to addresses things.