To be fair, there are those who achieve great success while displaying self-deprecating humor and humility. But on some departments, such examples become more and more conspicuous the higher one looks on the food chain. Indeed, at more rarified heights, I suspect they are the exceptions that prove the rule.
Arrogance Can Bite You in the Ass
Arrogance is an intriguing thing. On the one hand, it can bite a guy on the ass.
Example: As one of several deputies who testified in a case involving a lone perp's assault on multiple officers, I was advised at the trial's conclusion that one deputy's testimony had pissed off so many people in the court room that the prosecution was concerned about losing the entire case on his testimony alone. Throughout his time on the stand, the deputy had come across as confrontational and arrogant with not only the defense attorney, but the prosecutor as well.
Though the defendant was eventually convicted of multiple charges of attempted murder, it is worth noting that when it came to his assault against the deputy in question, jurors opted for the lesser charge of assault with a deadly weapon. This, despite the fact that there was no discernable difference between the modus operandi of the assaults, or injuries incurred—all of which occurred within seconds of one another and at the same location.