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The great enemy of clear language is insincerity. When there is a gap between one’s real and one’s declared aims, one turns as it were instinctively to long words and exhausted idioms, like a cuttlefish spurting out ink.
Political language - and with variations this is true of all political parties, from Conservatives to Anarchists - is designed to make lies sound truthful and murder respectable, and to give an appearance of solidity to pure wind.