I’m pretty sure the commenter you responded to agrees aggressive people are a liability and that’s the problem with current hiring(or at least the hiring contemporaneous to when they heard this).

From my own personal conversation with a hostage scenario trainer for the police, he said de-escalation forms only a tiny percentage of his training because that’s not what the cops want, even though he would make that the majority of the training given a free hand, since de-escalation doesn’t just increase the chances of the hostages being safe, but also the cops and the first responders.

Yes, I'm sure they would agree but I'm pointing out that the department/agency would agree as well. I don't think that departments were actively seeking out aggressive people, but rather seeking out people who could handle getting aggressive when a situation calls for it. Someone who can't get aggressive is likewise a liability.

I do see what you are saying regarding de-escalation. It seems like one of those things that is easy to mistakenly dismiss as "easy" and focus on something like firearms or tactics training.