It's a civil suit, not a criminal one (or, more accurately, potentially in addition to a criminal one). The department cannot bury a civil suit, nor trivially get it dismissed. And the burden of proof in a civil suit is substantially less than in a criminal one -- a "preponderance of evidence" vs "beyond a reasonable doubt".
The massive fines come from the civil suits, usually, not criminal ones. And that doesn't even count the ones settled out of court because paying them is cheaper than he legal fees alone for going to court.
So, yes, significantly reducing such suits is very much in the interests of both the police departments and (more importantly) the legislative bodies that fund them.