I don't understand white people

Do they have no sense of vigilance?
The proportion of the pure white population has now dropped to around 10% globally, and no matter how powerful their technology may be, there is no way to withstand the sheer force of physical population numbers. The gap is just too large.
Black, Islamic, Asian (Chinese), Indigenous, etc.
East Asian countries like ours still have a strong sense of Korean national identity, so we feel a great sense of heterogeneity toward other races and remain conservative. In this modern era, I think the unique mono-ethnic tendency of East Asia, including our country, will truly shine in the future.
I simply cannot understand white people. Why do they open up to other races so easily? It is obvious that their own homes will be taken over. A situation where they lose control due to physical population numbers is bound to come.
Even the US is practically more than half taken over by Black, Hispanic, Indigenous, and Asian populations. Pure white Western nations are on the brink of extinction.