I wonder, if O'f**kface announced interment camps and gas chambers for all Tea Party members, how many on the mainstream Left would react. I suspect that a great many more than we'd like to admit would be gleeful, some outwardly, many more inwardly.
That's where utopian ideologies always lead, because the True Believers are convinced of some variation of "if it weren't for (such and such people/groups) we could achieve this perfect ideal", while the more cynical simply see opportunity to get rid of people and things they don't like. That sort of thinking is what leads to mass graves and concentration camps.
It's like the contemptible Thomas Friedman constantly heaping praise on Red China and bemoaning the inefficiencies of our quaint concepts, like separation of powers and checks and balances. He gushes over China's ability to "get things done" without a lot of messy disagreement, blithely ignoring the very real implications of that sort of collectivist pragmatism, by which of course I mean the millions of people murdered by Maoists since the 1940s, and the continued imprisonment, One Child Policy, and so on. But the Friedmans of the world are not bothered by that, because it's the dictatorship of people they agree with. That's really all the Left ever means with their excessive use of the pejorative "fascist". In their lexicon it means a tyranny/dictatorship predicated on stuff they happen to not agree with. The mechanics of it are irrelevant to them. You could have identical mechanics and make the underlying ideology of a left wing, Marxist bent and they'd heap effusive praise on the same thing they'd otherwise condemn as "fascist".
That right there is one of the absolute hallmarks of the leftist: the ability to simultaneously adhere to contradictory beliefs and opinions without any sort of cognitive dissonance.