Random thought: when things are changing in my life, they often change almost simultaneously. So if I become depressive, or happy, there are five or six events that might have triggered it.
Another random thought: It always bothered me how in that one scene in The Matrix, the one where they pass some guards who are like "please present all your weapons" and Neo and Trinity have a whole arsenal under their trenchcoats, Neo has absolutely no qualms killing civilians. Sure, he has to kill them; that doesn't mean he wouldn't feel mental anguish over doing so. The guy is a hacker for crying out loud! Not a killing machine!