This reads as a non-sequitur to me. How is dehumanizing the enemy, which is an explicit aspect of military training, not a form of institutionalized outgroup hate?
I think you misread my comment. That is exactly what it is. I meant not as extreme in comparison to terrorism where it's perfectly acceptable to kill civilians etc.
It's just as extreme, and within the terms of the ethic being taught civilians are still fair game in military engagements. Even recent history has plenty of proof of this.