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or rather the point is not whether you need police to prevent crime or not but what constitutes as crime to begin with
The 95-99% of police that seem to be allocated only towards petty crime serve as a deterrent to serious crime. Suppose you have a cop directing traffic. A violent assault is much less likely to occur where that cop is, even if they're there for traffic, not assaults.
Interactions cut both ways though. Someone who got jailed for possessing weed might be more likely to do crime later because ppl won't hire him etc. So I agree there's a ton of added uncertainty but to both directions.
The solution to the problem you just described is not to reduce policing. It's to legalize marijuana possession.
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