But I feel as if someone at WotC was actually trying to build up tension in the class by tempting "good" characters to either be evil in some actions, or create characters that don't do evil, but are easily mistaken for it.
Oh, to be sure. If you meet a Drow on the surface, then either you're meeting Drizzt, or you're meeting any other Drow and they're about to poison you and sacrifice you to Lolth, the spider goddess of laughing out loud. You could easily mistake the Drow for evil. Unless you're genre-savvy, and thus you know that PCs are more likely to meet *the world's only non-evil drow* than to meet any other member of the entire species. On the surface, at least; if you meet Drow under the surface, then it's time to ask yourself whether your path to the Underdeep involved castles full of Giants.
If Drizzt joins your party and you enter Seaside Town with him, you can expect the ignorant peasants to form a mob with torches and pitchforks, because they will easily mistake Drizzt for evil.
Some players are happy playing right in the middle of a stereotype: the gruff Dwarvish warrior with a battle-axe, the unathletic, verbose human wizard, the cheerful cunning halfling rogue (with a heart of gold). Others would rather play the opposite: a barbarian elf, a half-orc paladin, the world's tallest gnome, or a Lawful Good warlock.
"Tonight, on Thinly Veiled Allegory Theater, a tiefling named Rocky Jackson joins one of the major Sportsball League teams. Nearly everyone hates and fears him, except for one enlightened, charismatic human coach who takes a chance on him. Rocky persists, turning the other cheek to mistreatment, muttered threats, and unfair rulings, until everyone who loves sportsball sees that he's really just like them at heart. At the end, the only people who still want him out of the League are those who hate tieflings more than they love sportsball."
(For those who don't get the reference: it's a thinly veiled allegory to a bit of USA history and culture, drawing a comparison to people who judge tieflings by their horns and tail, rather than by the content of their character.)