Evil races give someone the PCs don't have to feel bad about killing. Obviously depends on your party, but if they befriend the hungry wolf pack and negotiate with the bandits, then a band of definitely evil goblins gives the barbarian something to smash without worrying if they're killing little Timmy's dad.
Edited to add: And if "he's an evil race" is your only reason for them being a major villain, that's bad storytelling. About as bad as "yes they're going to help you because they're good," and not for some kind of benefit to them, monetary or spiritual or whatever.
Created an account to point out that Hafthor Bjornsson (played the mountain in Game of Thrones, world's strongest man at least once) has a wife who looks tiny next to him, and isn't dead.
Evil races give someone the PCs don't have to feel bad about killing. Obviously depends on your party, but if they befriend the hungry wolf pack and negotiate with the bandits, then a band of definitely evil goblins gives the barbarian something to smash without worrying if they're killing little Timmy's dad.
Edited to add: And if "he's an evil race" is your only reason for them being a major villain, that's bad storytelling. About as bad as "yes they're going to help you because they're good," and not for some kind of benefit to them, monetary or spiritual or whatever.