Justified ad hominem though - racism is not bad, if race is (usually) an accurate indicator of alignment. Wow, I kinda hated myself for typing that Nonetheless, racism is not bad if it is accurate. Ugg, going read some philosophy to take that bad taste out now.
Only necessarily true if one accepts the alignment descriptions exactly as written. Since this is impossible (they are self-contradictory), then it starts to depend how one decides to define evil.
For me, it always struck me that the D&D moral world looks exactly the same if you turn it upside down. If one imagines a morality colouring book, it reads something like:
This is a gang of orcs invading a human village, killing anyone who stands in their way, and stealing anything that's not nailed down. This is called "raiding". Colour it EVIL.
This is a party of humans invading an orc camp, killing anyone who stands in their way, and stealing anything that's not nailed down. This is called "adventuring". Colour it GOOD. Sure, you can claim that the orcs are also nasty and mean and LIKE killing, whereas adventurers are "merely" killing EVIL folks to rob them... but that seems a bit circular to me.
After all, if everyone in the multiverse really had complete freedom of choice to determine their own alignment, then there would be no such thing as a "typically evil". "Anatomy == destiny" is incompatible with the notion that everyone has a choice to be good or evil.
Couple that with the way that pretty much anything that "evil" entities do which makes them "evil" is also done somewhere, by some other entity which is described in rulebook text as "good". Like, say, torture. Sure, you can say that these things are okay if they're done to someone "evil", but then the universe starts to look the same when you turn it upside down, again.
Really, the alignment system is so poorly thought out, and so casually designed, that it cannot stand up to even five minutes scrutiny by a person of even the most modest philosophical bent. It was only designed to sort players ("good") from "things that it's okay to kill, because they're eeeeeeeeeeeeeeeeevil". In any game more nuanced than that, it just falls apart.