I've long said
Police should NOT be able to keep the money/cars/etc. they confiscate from criminals. That causes distortions in the types of crime they pursue and the choice of criminals they go after, and they're far more willing to do plea deals for lesser charges if the guy they arrested is willing to surrender assets even if they had nothing to do with the crime.
There was a case where some pedophile got off light because he forfeited a second home and cars - he was just a "consumer" of kiddie porn so he didn't make a dime off it. They just wanted his stuff, and didn't care about justice. If that money was put into a pot that went to charity so the local or state government didn't get to keep the proceeds, they would not have had any incentive to make such a deal.