In his Poem to Posterity, Brecht offered an explanation of far left excess and a partial justification for his own support for the crimes of Stalin.
Even the hatred of squalor
Makes the brow grow stern.
Even anger against injustice
Makes the voice grow harsh. Alas, we
Who wished to lay the foundations of kindness
Could not ourselves be kind.
His lines endure because they acknowledge a truth about political commitment.
Brecht understood that the certainty of your virtue will lead you into cruelty. Leftwing men can treat women appallingly and leftwing agitators can mimic the language and tactics of the far right.
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The Left are so convinced of their righteousness they cannot admit their fault.
From the G.
Pitiful aren’t they, the left wing, these days. Or laughable. Or both. Incompetent and nasty, certainly.