At home, “V Is for Varoufakis” posters hung in the windows of cafes. Greeks showered him with love, twittered over his looks, and wrote adoring satires of his glamorous life and wide-ranging talents. Varoufakis’s oldest friends were bewildered by the international fuss, but everyone I’ve spoken to who knew him before this ministerial turn says Varoufakis’s behavior on the European stage is typical: He’s outspoken, passionate and confident about his ideas. That, apparently, was the problem, because Varoufakis did not go to Europe merely to negotiate Greece’s future. He had bigger ideas. He wanted to show the Europeans how to save Europe itself.