But they don't to love it do they? Why?
Why? Because those who do are more desirable than those who don't. It's quite simple really. How is it not obvious that it would be of more benefit to us to have only those who love the UK?

I'm using the word "love" here casually. Like, respect the culture, not necessarily the history. I don't exactly admire wartime Japanese history, but I love their culture.