It would work but the human race hasn't got what would be required they can't see sense and clarity that well.
How do you stop any war in any country these days by 10's of millions of common people from both interest groups outside gate crashing the gd dm country and occupying the realm of peace and love not the one where you stay at home and shout at the TV telling yourself it's not that bad at least i'm not there.
Considering the unlikelihood of a smart enough critical mass what is there to do. I suppose after enough bloodyness near your door step you'll tell your people not to fight and so will they tell theirs for a while at least but does mankind really have what it takes to stand up to bullies and cross the divide.