I agree, this seems like a very good adaptation for the Drow. It's possible that since the Drow are Lawful-leaning elves in descent from typical chaotic leaning elves- that the Drow are elves that refused to descend into chaotic slaughter and madness like their evil-flopped elven ancestors, and were cursed by an evil sun god to banishment from his sight, where they can eek out a communistic society in the vicious underdark, where the brutal nature of their surroundings forces them to create an unbreakable sense of community and societal structure.