Libertarians are anarchists and anarchists are libertarians.
Somewhere in the 1970s some weird hard right people got involved in it and then somewhere from the 90s onwards Republicans turned Libertarian into right without the responsibility but traditionally libertarian and anarchy are the same.
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oh, and in the middle of it all, maybe part of the hard right influx or the cause of it, the big money “free market” people got involved trying to turn libertarian into some kind of free money thing.
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