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The only assumption I can see worth "working back" from is that the raiders were not worried about backlash. Why should they, when the media report their illegal raids as routine?
And when the police don't need to worry about being widely perceived as heavy-handed, how can one conclude that they feel more threatened than before, as some have commented?
I doubt there is any precedent for such behavior anyway. Criminals back down when they are surrounded. Did the cops in Birmingham suspect that the entire nation would be shamed?