Well I don't know if it's war or not, but why do you think the Party ended up omnicidal? There has to be something really bad outside the barrier which needs to be defeated or destroyed or whatever. Given the Malnosso aren't the ones which bring us to Luceti in the first place - well, ignoring inside the barrier - there has to be some other force doing that. It's probably also what blocks any control over who goes home or not.