Utilitarianism and the Naturalists

In a world that is heavily influenced by empiricism and the scientific method, a nebulous conception of the good seems mystical. John Stuart Mill tries to deal with the hedonism objection - you can tear pleasures. And this results in Millian imperialism: Britain should go around and lift up populations all over the world so they can experience higher pleasures. Even though there will be a loss of liberty for them,. There will be a lot of suffering for them because this will unlock in the future higher pleasures.