But why are drow, illithids, goblinoids, etc. culturally evil? Why were they driven to such a status, to become so morally destitute that, though they may not be on the verge of extinction, they still commit wholesale slaughterings of innocent bystanders? Personally, I like to blame racial hatred- the humans, elves, haflings, dwarves, gnomes etc. (good creatures) banned together to poopoo the 'evil' creatures, all of which happen to either be ugly (beholders), carnivorous in disturbing ways (vampires, goblins) or both (illithids). The only exception to this rule is the drow, who I think were simply massacred by the elves for sadistic glee...
Translated- I believe that, under the pro-munchkindomness of DnD in today's day of age, every race is evil. The 'good' races committed horrible attrocities upon the 'evil' races for being socially unacceptable. In response, the 'evil' races fought back. Over time, though, the 'good' races wanted to seem higher than the 'evil' races and thus left the 'evil' races to wallow in morally destitute practices such as slavery and rape. However, because war is an evil act unto itself (regardless of the circumstances), nobody is really the 'good' guy. Everyone is involved in the brutalization of races, the hatred of peoples and the pillaging of cultures. And to think this could have all been avoided if TSR had made DnD less battle oriented and more role playing oriented, particularly in 3rd Edition (which is so unbelievably munchkin I want to hurl.... excuse me, I'll clean that up). Tut tut, silly munchkins.
Clarification- the munchkins I allude to are not the small people in Wizard of Oz, but rather those presented in the Munchkin's Guide to Powergaming. They might be better known as powergamers, tweaks, min-maxers etc.
Edit: Added clarification