I don't think some larger system wants cops ignorant, as much as it's the dynamics of corrupt self-preservation.
If corrupt sheriff Moe Carpaio is accepting bribes or selling drugs out of the evidence locker, Moe needs to hire juniors who are less likely to blow the whistle. Much of that involves in trapping them into the perpetuating cycle of crime, and that's easier when they don't have lots of other employment options.
If corrupt sheriff Moe Carpaio is accepting bribes or selling drugs out of the evidence locker, Moe needs to hire juniors who are less likely to blow the whistle. Much of that involves in trapping them into the perpetuating cycle of crime, and that's easier when they don't have lots of other employment options.