I stick to whatever is most comedic or interesting, such as running into rooms with a shotgun firing in a way that syncs to the tune of "Banana Phone". as for moral compus, I might as well be in the center of the earth. I shoot through hostages, burst into rooms to only shoot those I'm supposed to save. And if the morally bad choice gives me something cool I'll take it, then turn to the guy giving it to me and bash his head in with it.
Although sometimes I try to be good, does not last.
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It's safe to say I have only killed innocents a few times in video games. I don't even realize what I'm doing most of the time, I just act on instinct, which is generally being the good guy. One of these days I'm going to have to buckle down and force myself play through an rpg and do all the bad stuff (like blow up Megaton for once..).