Nature or Nurture

If you want to bring your game to a halt, introduce the moral quandary of the nature of good and evil in a roleplaying game. Such as: are goblin babies evil? Is it wrong to kill goblin babies?

Goblins are evil in the Monster Manual/ Bestiary so they’re innately evil creatures. But, if they’re raised by another culture, will they become good?

It’s effectively a free will vs innate nature argument in a fantasy world where gods are real and absolute evil might very well be a thing. It’s discussing philosophy in a setting where our own philosophical arguments and assumptions might be invalid, which is a little like trying to do physics in a world where gravity isn’t a constant.

Of course, when the little buggers are biting you all bets are off.