The militarization of law enforcement and its consequences have been a disaster for the human race.
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I’m not sure what it means for US police to have “evolved out of” slave patrols in places that never had slaves, like New York City (northern states didn’t want to enforce the Fugitive Slave Act), or even in places like Hawaii that were founded well after slavery was abolished.
https://www.policemag.com/weapons/article/15348048/how-the-n...
Of course, there must have been many other causes. It wasn’t the first time in US history that police were outgunned.