I can think of one reason ... high incarceration rates lead to lower crime.
I'm being facetious, but I suspect that has something to do with it. There are other factors no doubt. Freakonomics claims abortion was partially responsible, I read somewhere video games are partially responsible (i.e. incentive to stay home instead of going out). I've also read that higher lead levels in air and water in the past may be responsible for higher crime rates, etc.
I'm sure there are a lot of factors that explain the lower crime-rate.
The problem for you is that cops aren't responsible for the crime rate. They are called to deal with it.
>Plus with how fucked up the prison system is in the US.
You don't actually think the vast majority of people in State or Federal prisons are actually innocent do you? (Because they aren't). Another myth is that there is some huge proportion of inmates serving time for non-violent drug offences and drug possession - that's not true either. Almost nobody goes to prison for simple drug possession or low-level drug offences (prisons are too full for that). Those chargers are usually pleaded down from more serious violent charges.
Having said that, US prison sentences are also an outlier, but that's a double-edged sword too. Harvey Weinstein was sentenced to 23 years in prison for sexual assault and rape (third degree). Having spent time abroad and having family all over the place, in most jurisdictions, he would not get any prison term or would be paroled within a short amount of time.
I see this dichotomy in American thinking all the time. There are calls to lower prison sentences, while at the same time accused individuals (who are usually unlikable - like Weinstein) have the same people calling for maximum sentences so those individuals spend years behind bars. Reducing prison sentences does necessarily imply murderers, rapists, child molesters, would be out in relatively short amount of time (10-15 years typically, if you compare to prison terms in countries like Canada for comparable offenses) - are you OK with that?
>You don't actually think the vast majority of people in State or Federal prisons are actually innocent do you?
No, I don't. But the system is still horrible and brutal. I think think prison in the US should focus much more rehabilitation over punishment. In Germany and Scandinavia being removed from society is the punishment. Norway has a recidivism rate of only 20%. I don't know the other countries, it's higher in Germany at 35% but still less than half of the US which is a total failure. You treat people prisoners like animals and you are surprised when they act like animals.
>I see this dichotomy in American thinking all the time. There are calls to lower prison sentences, while at the same time accused individuals (who are usually unlikable - like Weinstein) have the same people calling for maximum sentences so those individuals spend years behind bars.
So I think prison sentences should be reduced generally in the US. I'd get rid of mandatory minimums. But I'm not sure how I would fix it, but I would have charged the bankers, and people involved wit that in jail. I would change background checks too. Norway, and as far as I know, Denmark does this too, but if you're applying for a job, nobody will find out about your crime, just if you're available to work somewhere. For example, if you apply at a bank but you were guilty of financial crimes, they would tell the bank you cannot work there.