Playing an evil character doesn't mean you're using every evil option the game offers, and games don't need to offer every imaginable evil option.
It would get pretty boring playing a goody two shoes who is too scared to kill some fake pixels.
Would you also agree to the following:
It would get pretty boring playing a goody two shoes who is too scared to rape some fake pixels.
It would get pretty boring playing a goody two shoes who is too scared to skin some fake pixels alive.
Has this happened in the Middle Ages? Yes. Would the "unholy god of death" do this? Yes. Does that mean it has to be part of a role-playing game in which you can play evil characters? No.
Sure, your character's personality can be very different from your own, but most of us are playing in order to have fun, and there's a very individual limit to what we can enjoy or bear. Especially if a realistic graphical depiction of atrocities is accompanied by realistic audio.
