This seems like a genetic fallacy. Police might have been former slave patrollers at one time in some places. That doesn’t mean all US police are the same or have anything in common with them.
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.
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.