The Arab Spring, as a moniker for the revolution that seemed about to sweep the Middle East earlier this year, has given way to far less cheerful seasonal metaphors — from long, hot summer to dark, dismal winter. In Egypt, where “people power” toppled Hosni Mubarak’s corrupt dictatorship, the dream of freedom has morphed into a nightmare of mob violence and military crackdown. In other countries whose dictators have been more willing to use extreme savagery to hold on to power, the opposition is getting slaughtered — except for Libya, where Western intervention has made the difference.