I mean if we applied the complaints about violence in D&D to an actual campaign:
"Please noble heroes, save my people," begged the villager, "Valdniput's hordes are ravaging the land, enslaving all those they don't slaughter! None are spared, not women, children, or the elderly or disabled! You're our only hope."
"I'm very sorry but we can't," replied the Paladin, "Using violence against the invaders would make us just as bad as them. Besides we're not from your kingdom so it would be imperialism, which is bad even if the only thing we'd be doing is helping defeat a genocidal invasion. And maybe Valdniput the Unrepentantly Evil and Endlessly Cruel grew up poor or was otherwise wronged in the past and thus him slaughtering your people is somehow excusable. Besides, he's creating jobs for the unfairly discriminated against child-eating Torture Demons in his army."
"Um actually us Torture Demons don't NEED to eat children, we just choose to because as our names suggests we are demons who enjoy torturing people," cut in a Torture Demon, "The villagers are entirely correct to want us gone, we reject morality of our own free will. Now if you'll excuse me I have a child to eat."
"MWAHAHA!" laughed Valdniput as he kicked a series of puppies, "ALL SHALL BOW BEFORE ME! Now grovel at my feet and I might let you live the rest of your miserable lives as my slaves instead of putting you all to the sword!"
The Paladin nodded. "See, he's offering a peaceful solution. Clearly it would be wrong of us to fight him. Besides, maybe Valdniput isn't Evil and is instead villain-coded and thus we should side with him against the actually Evil peaceful villagers. After all the status quo is Evil and Valdniput is disrupting it, thus making him Good."