Savage Wombat
Hero
Well, you could use something like "restoration" or "preservation" as the positive word to better oppose corruption, if one of them felt right. Another word with a connotation of "building faithfully" might work better than those.Interesting! To me, corruption is important because it is an active force. The adventurers can't just sit around counting their gold, because the forces of corruption are actively making the world a worse place. It implies that action must be taken to prevent corruption from occurring.
It also, to me, ties into the idea that a lot of building a better world is in strengthening communities. Corruption is what destroys communities (in my view).