An interesting article
I don't agree with all of his hyperbole, but the last paragraph seems the best:
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So we have the PD recruiting bouncer types. They tell them that they are needed by society and that they are heroes. Then they drop them into a hyper macho culture fostered by a close-knit tradition and the cop unions. Then the PD and the unions tell them how dangerous their job is, and they might not see their family again. They say that they need to be over-gunned to be safe. The PD then gives them high-capacity firearms with easy trigger pulls. They tell them they are fighting a "war." They then tell them to go "in country" after telling them that the criminals may be armed, and to be careful. In other words they propagandise them with Marine Corps cant.
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And just for good measure,
Overkill: The Rise of Paramilitary Police Raids in America