In 1) he's actually advocated revolution. It happens to have been in a time of extreme social injustice. , just incidental information, so we don't know whether he would have advocated revolution or not had it not been a time of injustice.
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navitasanI think the comma changes the meaning.It does, but as a purely practical matter, I would not depend on the average reader to pick up on that fact. If you want to write something like this in an essay rather than as an example of a curiosity in English punctuation, you'd do better to rephrase the statement.