A man may take to drink because he feels himself to be a failure, and then fail all the more completely because he drinks. It is rather the same thing that is happening to the English language. It becomes ugly and inaccurate because our thoughts are foolish, but the slovenliness of our language makes it easier for us to have foolish thoughts. The point is that the process is reversible.
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Orwell on Sincerity, Clarity, and Politics
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 squirting out ink. In our age there is no such thing as "keeping out of politics." All issues are political issues, and politics itself is a mass of lies, evasions, folly, hatred and schizophrenia. When the general atmosphere is bad, language must suffer.