After the Revolution, the Left Always Needs A Zamboni

The unrelenting speed and undiminished fervor with which liberals are killing the careers of their former comrades in politics, the media, and the arts may appear unseemly and contradictory at first glance. Yet based on historical precedent, it's also remarkably predictable, perhaps even axiomatic. It's what often happens when the Left tastes power.
The Left exhibits a compulsion for executing its own, once some are no longer regarded pure enough, ideological enough, or radical enough. This pattern of behavior dates back to the original left-wing triumph, the French Revolution.