I agree with the last commentor in this old tumblr screen. I don't enjoy being cruel to others, even just video game characters. I made myself once for Dragon Empire and just felt bad since I'm neither a sadist nor a massochist.
Yes, they are not real and I'm not judging those that do evil runs. My brain isn't wired that way, however, and is prone to feeling empathy, even towards the non-sentient, scripted bundles of pixels and data.
It turns out when the options are Comically Evil and Generally Decent, most people will choose the latter. The Mass Effect devs reported that 90% of people chose the "good" route in that game.