For some reason it has become acceptable for "authorities" to give really bad advice out as long as it is PC.
The idea of non-resistance to aggression seems to have come from some of the eastern religions and worked OK for Gandhi, but he was up against a mostly moral, rational, and ethical opponent.
These nut cases are not moral, ethical, or rational, nor are street thugs.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob