OF COURSE they are. It's what Goblins DO. Why? Oh right, because Goblins are EVIL. So, yeah, they are "engaged in Evil." If they weren't why would you be encountering them at all?
That's a pretty circular argument. Goblins are Evil. Why? Because Goblins do evil things. Why? Because goblins are Evil!!!
In my world, goblins are more complex than just giant pests that deserve squashing by casual adventurers. They actually have culture, religion, and wars not based on evil, but on ideas that humans (and other humanoid races) can understand and empathize with. They worship my world's "God" of Magic (not really a real god, it doesn't have a physical form and isn't really sentient, it's more of my world's version of the Weave, if it were put in a blender and held together in a ball with super-glue. But they worship it, and it grants them divine and arcane magic, and can even turn some of the goblinoids into arcane angels). They base their culture around this religion, and the religion isn't inherently evil, it's just very rigid on its thinking of psionics (and there is a race of psionic people that they hate and routinely go to war with).
Now, some of these goblins are truly evil, wanting to completely eradicate innocent/passive psionic races just because they dare to exist, however, there are other goblins that are more accepting and shun the practice of psionics but don't berserk every time they see a psychic character. Some are good, some are bad. Like humans.
Does that make them humans, though? Are they just a group of humans in silly hats? No, they're not. They're still goblins. They're still small, sneaky, yellow-green skinned, big-nosed humanoids, and are distinct from humans, elves, dwarves, and the rest of the races in my world. Being like humans in their ability to have more than one alignment doesn't make them human, anymore than the fact that a cow having hooves and a deer has hooves doesn't them the same thing or invalidated by the other.
Orcs are the same way in my world. So are Gnolls, Bugbears, Hobgoblins, Drow, Kobolds, and pretty much every other humanoid race in my setting. But they're still unique, and IMHO, are more interesting because they are more complex, not boring or idiotic.