Their history is full of clans fighting each other, constantly war focused, even before the corruption... I am looking for examples where orcs have actually been okay with living in peace with anyone over a prolonged period.. I haven't found it yet.
So I look to their lore, in the time before the legion that was described, and even then you would have clans having feuds and it was actually culturally encouraged.
You're not evil attacking a clan for food and water, and in arguments or disputes, the winner is resolved through a good fight.
I mean can a race like this ever live in peace with others?