While a whole M.A.D. thing is one way that could bring "peace", I think it's more likely that the idea is that Janis is hoping Parson breaks things so hard, that it brings about change. Maybe even beyond just simple rules, but break the culture, the ideas of that world.
Parson really isn't one of the bad guys, it's just he's a good strategist. Maybe even the best the game world has ever seen. I mean, he did beat Charlie.
But, maybe most importantly... Parson unlike pretty much every other warlord could actually appreciate the idea of peace. It's probably an utterly alien idea to the world. "Peace, what's that? You mean that gap of time that we spend building up units?" Parson actually values life. And freedom. Values that aren't necessary for "the game".