i think it's not so much as protecting our attacker(s), but more so in protecting ourselves. protecting the after trauma, post action if you will, of hurting/maiming/killing another human being. protecting our moral compass, for those who have them, from the after action.
question, if one doesn't embrace one's darkside, the anger, the rage, the fear, the hopelessness, and so on, then wouldn't that makes one incomplete? sort of yin yang, in yo, hi ho kinda of thing? just wondering. personally, i liked my darkside; other bugger is alot of fun.