The problem with intelligent LEOs is that they think they know far more than what they really do know. Or, the know so much that is not so. Just as do our liberal friends.
Unfortunately, some unknown number of very intelligent cops make for the worst right abusers. Which seems to indicate that they are rights abusers by choice and not by some intellectual deficiency.
I think the problem stems more from ego rather than intelligence or lack of with rights abusers. Some officers get past the ego adrenalin surg, some don't. Lately it seems the gov is doing all they can to encourage it.
It is not a problem solely to police officers, we see it with a lot of our public that think their authority is higher than what it actually is. There are wannabes in almost every aspect of life, such as wannabe cops, wannabe soldiers, wannabe lawyers. In most cases IMO these people are harmless annoyances, but in some cases such as Adam Lanza(wannabe soldier) they are dangerous.
IMO I don't think Peterson's homicidal activities had anything to do with being a cop, but rather some mental disorder.