Visions of future past
In our lifetime we will have seen the Western countries not just close but to barricade their borders. Should an unannounced ship approach, carrying desperate human beings fleeing the wars and the devastation, we won't be even allowed to think about accepting them.
The ships will be, not stopped and turned around, but torpedoed and sunk on sight. The drowned will be harvested for feed and fertiliser.
My only consolation is that I am old enough to not necessarily witness all of it.