What exactly is wrong with right wing populism happening in Europe?

Whenever it comes to making an ethnostate in the US, a common response I hear from the left is usually something like "You don't own the land. It was taken from the natives."

Ok.... well, when it comes to the right wing populism in Europe..... what exactly can they say at that point considering the plain fact that white people's country of origin is Europe to begin with? Why shouldn't they have the right to make their country the way they want it, since it's always been a white people's continent?