its not about removing all friction and conflict between people (which is indeed on the utopic side) but eliminating certain types of organized, large scale violence that is supported by ever more lethal tech (which in the end *will* be our undoing).
Its not hopeless because we are already doing it (constraining this behavior) to some extent. Its not difficult to imagine (and historically it was common) to be far more warmongering.
Eliminating organized war is solvable