You're thinking of it in the wrong context.
Maybe, I'll grant that. With that said, it was drummed into heads and became a social "cool guy" thing to say and repeat. Whatever Grossman's intentions it became a perverted social construct of "us vs them." That is what it has become, no matter how it started.
Creating a mindset had the secondary outcome of creating a social division, one that shouldn't have to exist in a warrior's mind. Police training or society are so bad that our society had to turn them into "warriors?" They used to be called "peace officers" but now they are "warriors?" Warriors close with and destroy the enemy, they engage in combat. No one seriously thought that turning police into warriors or combatants was a bad idea?
Back when we served together, I bought into sheep and sheepdog. Now? Not in years, it has become something twisted and needs to go away.