Gygax on alignment:

“Paladins are not stupid, and in general there is no rule of Lawful Good against killing enemies. The old adage about nits making lice applies. Also, as I have often noted, a paladin can freely dispatch prisoners of Evil alignment that have surrendered and renounced that alignment in favor of Lawful Good. They are then sent on to their reward before they can backslide.

[…]

Chivington might have been quoted as saying "nits make lice," but he is certainly not the first one to make such an observation as it is an observable fact. If you have read the account of wooden Leg, a warrior of the Cheyenne tribe that fought against Custer et al., he dispassionately noted killing an enemy squaw for the reason in question.”

Love to use historical genocidal racism as a basis for a morality system! Its apolitical though, you’re not allowed to have reservations about an admitted racist representing certain peoples as inherently evil and worthy of extermination. That’s not even getting into DnD portrayals of “darkest Africa” and “the mysterious Orient”