If professional athletes can represent more than one country, let alone multiple clubs, why shouldn’t fans change teams? “I was fanatically pro-German when the Germans were here to protect us against the Americans, and now that Americans are here to protect us against the Germans, I am fanatically pro-American … you and your country will have no more loyal partisan in Italy than me – but only as long as you remain in Italy.” This passage from Joseph Heller’s Catch-22 – as an old Italian man exp…