That's not evidence; you'll have to show that at least 50% of the population believe in 'preserving Japanese identity' and have voted as such to limit immigrati

That's not evidence; you'll have to show that at least 50% of the population believe in 'preserving Japanese identity' and have voted as such to limit immigration, for that purpose. Otherwise you're talking from nothing, just your intuition. It's an easy intuition to have, I'll give you that.