What? 
Dude, it's the same thing in a war. You're surrounded by the people who want you dead, you go and kill them in order to protect yourself and/or your country. But you're left with traumas.

Dude, it's the same thing in a war. You're surrounded by the people who want you dead, you go and kill them in order to protect yourself and/or your country. But you're left with traumas.
Though I would definitely be traumatised by killing civilians, but not other fuckers shooting at me. But probably it's just easy for me to say here without actually experiencing it.
