Came off harsher than I intended. Also it's worth noting their names don't come from themselves, but from who saw them first. Wizard is the most obvious name for the floating, robed creature throwing a flurry of magic. Knights are armored and are also seen with massive swords, so it was a logical name. Also, just because they may perceive themselves as in the right, their actions are proof of the truth. They would have destroyed a prospering and probably peaceful race. Just because they think they are on a righteous crusade, it doesn't justify or erase that. That being said I won't be surprised by a Traveller/Speaker plot twist.