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.
I already explained how evil endings for games have you destroying the entire world. In that instance children will be killed. Whether it's your character unleashing some sort of evil upon the world or becoming a vessel for a demon it all leads to the same result and the forces of pure evil do not discriminate.
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.
No I won't agree to the following because a goody two shoes character wouldn't be raping or murdering in the first place.
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.
Says who? Do you happen to have the legendary book of "What a real RPG is and how RPG's should be played"? I didn't think so. The fact is, if the option is there then it's there for a reason.
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.
So it's fine killing adults who could have families themselves but anything beyond that is bad? Okay. So next time you encounter a bandit in Divinity 2, don't kill him because who are you to say that he's not simply a bandit to provide for his starving diseased children who will die GRUESOMELY if he quit his job? Oh and say the bandits are FORCING him to be a bandit and he has no choice but for the love of his children, he is doing what he must to ensure their survival.
I don't understand your point. If you play a goody two shoes in every game then that's fine by me. I have no problem with that but I don't get why you expect me to do the same when I have fun playing characters of all alignments.
In D&D you have three alignments: Evil, Neutral and Good. Then you have three different forms of them. You have Chaotic, Neutral and Lawful. I often play a chaotic evil character if I decide to play an evil character at all. It makes the difference as you gain EXP quicker at earlier stages, you gain better equipment at earlier stages and it's fun not being shackled to all the people who would have you running errands.
But if I'm evil in real-life for "murdering" some pixels then Black Isle, Bioware, Larian, Ion Storm and Capcom must be the children on the devil for planting such things in their games and presumably testing them.