Participating in the acts of violence and evil deeds in videogames is much more valuable to the player than doing good things.
By directly enacting morally wrong or gray actions in a grounded context in a virtual world you are compelled to impose it on yourself and think about yourself, rather than just being satisfied with playing out the hero trope.
That is, of course, if the game actually provides that proper context and is being honset with the player. I'm not talking "Hatred" or Illusions chikan simulators, I'm talking Tyrany or New Vegas.
Few games try to cast you into a role of a villain without making it campy or trivializing it for the sake of funsies.
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