I think your argument is sound and I like the hope that you have. However, I’ve always interpreted that verse from the Beatitudes a bit differently. I’ve always thought of a peacemaker as the person WITHIN the argument that argues for peace and chooses not to fight. You’ve taken a more general look and thought of a peacekeeper as someone from the outside who has to step in and stop a fight. This would make the understanding of the Word of God a little bit more challenging when applying it to this situation.