Anybody who's been in the shit and says they weren't effected by it is a liar. I don't care how professional they are, how tough they are, if they've seen their brothers (or sisters) blown up or shot, if they've seen kids who've been burned or mutiliated, if they've been in contacts where innocent people get fucked up or die, if they think their bullets or fragments may have killed somebody that didn't ask for it, if they worked in combat trauma trying to put people back together, if they've seen their counterparts do some sick twisted shit, if they themselves have laid there bleeding in the dirt waiting for the enemy to come up and finish the job, no matter what the fucked up shit they have seen, it will fuck them up to some degree.
Look, I've seen torture, executions, burned children, a friend shot dead in front of me in a green on blue, seen buddies hit boobytraps, been hit myself and overrun, was more scared of being taken prisoner than I was that I might lose my left leg or foot or right eye, been in contacts where innocent people have been collaterals and nobody knows who's bullet or frag did the damage but you live with the guilt anyway...and if you doubt me PM me because I can attest or document all of it in vivid detail, living color. War is the most fucked up thing anybody can do, and if you've lived it, you know it. I don't watch much UFC so I'm not too familiar with all the fighters, but if this guy is trying to work out his demons by opening up, God bless him and I hope eventually he will come to terms with it...because there is no peace...It's there forever...war becomes a part of your character. The best you'll ever do is accept it, find comfort in the company of your peers, and over time learn to appreciate every positive thing, everyone who loves you and every fucking alive day.