Japan is a homogeneous society. The slams will never take Japan.
But it points out one of th problems with the Islamics. Their countries are far more homogeneous today than they were in 1940. Nearly all the million Jews living in Islamic countries were driven out between 1947 and 1952. Much of the Christian population has left. Hindus, Sikhs and Buddhists have been sepearted or expelled in the Eastern Islamic countries. It's recipe for behaving the same way the Japs did.