The issue at hand, at least from my veiwpoint, is "relative culture". If your entire society is based on certain precepts, the chances of you deviating from it in a massive way are slim to none unless some huge life-changing event turns you away from it somehow.
To wit, if you spend your entire existance as a Drow, the chances of you randomly acting within the usual Drow societal norms in a manner that 1) won't get you killed by someone who realises that you're an idiot or 2) get you dragged into the local temple of Lolth for heresy(which just so happens to closely reasemble #1) are really, REALLY slim with an alignment of something-Good. All of the rituals, societal actions, and usual interactions (like that dagger interacting with your back) would sicken you and your revulsion would be obvious to all but the most dense of beings. Add to this the generally overly-cautious, Machivellian nature of the Drow society and the fact that "childhood" lasts well into the fives of decades and you soon find yourself in the situation of #1 and/or #2 above.
Granted, you can have an epiphany(sp?) and other such random reactions to your surroundings which would prompt you to bail from the said society, but leading a "normal life" or anything reasembling it would be pretty much impossible.
This said, while PCs are supposed to be exceptional and "interesting" the Good Drow is a cliche' that should be stomped upon with the biggest cork boots that you can manage on General Principle.
In other words, "Hell no, fangeek!"
Mark(psycho)Phipps( HAHAHA! )
Proud player of Brock Tyrsblade, Fighter - 4/Cleric of Tyr - 4 with a Divine Helm of True Seeing.