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You'd think on a local level, a commander or incident commander would simply say "I'm not risking my men for this nonsense."
You are assuming that a police commander would consider busting "hippies" for anything whatsoever to be nonsense.
That is an unwarranted assumption.
Hippies are the most dangerous group in American to a lot of right wingers, and the cops, while not exclusively right wingers, lean that way so far they have to use outriggers to keep from turning turtle.