From the introduction...
If you wish to play an evil character, you might act exactly as you would play a good character, except in reverse. Instead of going out to slay the red dragon that has been terrorizing the elf village, you go out to slay the gold dragon that has been terrorizing the orc village.
Am I the only one who loathe this kind of conception of evil? It's really saying "orcs are evil because they are orcs, elves are good because they are elves."
So, Evil in D&D is kind and caring, devoted and selfless, just like Good. They're just the other team -- Good is the Blue Team, Evil is the Red Team, changing alignment is just changing your shirt.
For example, Druuzkar the Merciless, orcish half-fiend blackguard vampire, when not slaughtering baby elves while looting forests, run a shelter for hyena kittens and funds an orphanage for dispossessed orcs and goblins. He's also famous for his lobbying as a kobold-right-activist, and he always help old hags crossing the street when there is heavy traffic.
Dang, that's just completely ridiculous. Although it could make for a fun parody campaign, outside of satire, it's just silly.