Case in point: Orwell uses passive constructions 40% more frequently than than an average English corpus. This essay is full of them. Language Log did a brilliant analysis of the essay's towering inaccuracy and hypocrisy:
http://languagelog.ldc.upenn.edu/nll/?p=992
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If it is possible to cut a word out, always cut it out.
And wouldn't you know it, the very first sentence of Orwell's essay runs:
Most people who bother with the matter at all would admit that the English language is in a bad way, but it is generally assumed that we cannot by conscious action do anything about it.
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His rules are bullshit, and he knew it, which is why he was smart enough to ignore them completely.