I have no evidence besides my own experience, but I think that the "back the blue" mentality might skew their support staff's objectivity a bit. Especially in smaller cities and towns where cops aren't just law enforcement, they are foundational pillars of morality and governance. The point I hope I'm making is that they are getting bad advice not because they are stupid, or the people around them are, but rather because it's inevitable due to complex social and psychological reasons.