But arresting someone reasonably suspected of some crime isn't bad policing, even if they are later found to be innocent. That is why arrest and trial are separate.
There's a LOT of good cops, lawyers, judges, etc. However, the bad ones can have such devastating effects on their victims, that all of them need to be watched (controlled? not sure what the right word is here) more than would be necessary for other areas.
However, I agree that if that should happen, the detained should be compensated for the harm they suffered, even if the police (and prosecutors!) acted reasonably.
I should clarify that I don't mean to imply the US police and public prosecutors meet these reasonablenes criteria - from what I hear, the deck is stacked heavily against anyone being prosecuted for a felony, guilty or not.
But I don't see how preventing companies from being able to fire people solely because of an arrest actually costs them anything.