I faced a similar question on my first run through the city, myself. I wound up deciding that
(Enemy of Lawful Good surface dwellers = Kill them all) and
(Enemy of Chaotic Evil Underdark Drow = Let them live).
So I decided to demolish their social structure by disposing of their leaders (King first, then Prince) but leaving a few of them alone, to provide at least some obstacles to the Drow and the Kao-Toa. Turns out I might as well have exterminated the lot....considering what I did to the Drow and Kao-Toa. [img]smile.gif[/img]