Imagine 90%+ of the violence in the world gone. Imagine trillions of dollars of new money available for life affirming projects. Imagine world peace.
So you think a peace pill is no possible solution because it will be used by violent men as a weapon against other men. By extension you correctly realize that it is impossible to force a peace pill on all (violent) men. But on the other hand you think it is possible to remove all men from existence (i.e. kill them?).
So you think most men value (their capacity for) violence more than their existence? Or why do you think the latter is easier than the former?