Why is that a bad thing? Every single race or culture has a right to want to preserve itself. Maybe you have some personal issues you need to work out before you go off projecting self hatred onto other cultures.
"Japanese" isn't a race, and culture isn't a function of racial identity.
If these things were true, then American culture would belong only to one race, and it clearly doesn't.
Also, see Han (ethnicity) and Chinese (nationality), where outside of China the latter is often used to mean the former.