MARTIN AMIS hates nuclear weapons, and he doesn't care who knows it. In fact, he wants everyone to know it. At mid-career, he has virtually ceased to be a writer of fiction-from 1974 to 1984, he published five comic novels, including the hugely successful Money-and has metamorphosed instead into a kind of anti-nuclear polemicist. Einstein's Monsters, his most recent work, is a collection of sto...