You know, I think that McKay and Carter have a competition going on.. as in which one of them destroys more solar systems. Then again, Carter did it on purpose, McKay did it accidentally..
Question is, which one of them has the lead at the moment?  I'd say Mckay has  the lead.. first that ancient weapon went haywire and solarsystem went boom, then he nearly destroyed parallel universe with exotic particles, and finally the replicator homeworld blew up.