That's why Henry ought to join with Krieg and the Machina. Get him that rocket and conquer space for the Machina. 

Krieg doesn't want nor plans to pursue peace. He's going to this battle to recruit people who might be seeking a faction change, as well as test out the abilities of the suit. The closest thing to peace would be total Machina domination in the Nexus, and we all know that would be a path of blood and hardships.

Fran is probably more inclined to peace but as you said, more along the lines of damaku battles and festive orgies. She ain't got the political clout or powerful enough magic to brainwash entire factions into being all peace and happiness. She just want a free loving future, since you can rape anyone anytime.