I mean, traditionally, any party of PCs will instantly attack and kill goblins on sight, no questions asked. Is that "good" behavior?
Great picture!
The answer is, IMO, it depends. How much emphasis are you putting on "traditionally?"
I think that there are two ways to look at this:
1. The campaign setting, like the real world, has moral nuance. An orc, or a goblin, or a humanoid is not necessarily "evil." They just have different motivations than we do. Humans have fought each other throughout history without being "evil," and it's certainly possible that a goblin attack on the local village wasn't because the goblins are, and always will be, the baddies, but because the humans encroached on their territory and put their village on the goblin's sacred land. Who knows?
2. The campaign setting is not the real world. It's fantasy archetypes. There is real "good" and real "evil," and baddies are baddies. Nuance is just the name of the Elvish Mage, and if orcs weren't made to be killed, Gygax wouldn't have created them out of XP.
shrug I think people can, and do, play the game differently. I think that (1) is certainly more prevalent now, and, tbh, it's been pretty hard to keep up the (2) ever since "monstrous races" became playable with a choice of alignment.