Yeah, I can understand the initial trust in law, and maybe debatting it later. This is not my way of thinking but i admit it’s really reasonable.
For the terror, my reflexion is the following : army/cops try to maintain a specific system in place and have 2 ways to do so. For people who (more or less) actively defy their authority, they take violent actions (kidnapping, pressure, wounding, killing, etc). For people who are not (yet) actively defying their authority, they hope that their violent actions will make people afraid of them, so they do not act against authority. I refer to thz first part as killing (though it’s not only killing but more generally violent actions against people), and the second part as terror.
So, imho, though war crimes may spray more terror in a single act than usual army stuff, both spray terror in their own way.