Why should you care what's going to happen with your race? It make sense to want ethnic homogenity in the place you're living, but you will always have that choice your whole lifetime. There are almost a billion white people, for your lifetime, they won't shrink to that number where you won't be able to do that.
But why would you care what happens after you died? Theres nothing that will affect you. You will get eaten by insects and nothing is bothering you.
You might say, well you can also say this means you shouldn't care what happens to your children. And I say yeah, what happens to them after you died doesn't bother you aswell. Theres really no reason. There is no special place where you will watch them suffer in their lives.