Honestly, this is where we are hurting ourselves with all the current trends of "you have to have PTSD". This is in no way to diminish actual cases of PTSD, but I for one am sick and tired of the long growing trend of telling everyone how bad they need to feel and how psychologically harmed they are if they have to use lethal force to save their life. The best thing that ever happened to me in this regard was not the Ayoob stuff, later Grossman, and others, or the cop shrinks, but the old guys. See, there was a time where the grizzled old guys with time in combat or who had done righteous violence on crooks would pull you aside and tell you what you did was good, and you didn't need to feel bad about it. That helped far more than much of the other crap. Also.....I made a significant change in my place by being crystal clear in training that you may have to make a decision to use lethal force to save your life or the life of others as part of firearms training on mindset. Even used the "Kill" word, and was very blunt about it. We really looked after our own with the folks who had been in shootings taking some time to talk to those just in them. I had a Vietnam vet with a ton of combat time at my place who had been a cop for pushing three decades tell me after training that my class was the first time in his career anyone ever came out and said that you might have to kill someone and that it was sorely needed. Grossman's stuff does not help. It does not help to ground cops who are able to use lethal force and figure out how to do it without becoming a raging alcoholic or basket case. We have folks in the military who are damn good at being efficient in war and not turning into mental basketcases. We should be tapping into those folks instead of ostracizing them or silenceing them because they don't feel bad enough or become "disabled".
Sorry for the rant, but it is a subject that simply pisses me off. We needed to develop a "kill switch" in folks, and teach them how to turn it on and off, rather than try to constantly disable it in everyone.