It might actually put the police on notice as well, i.e. properly incentivise them to do higher quality work.
Lots of police officers are reasonable people trying to do a difficult job with integrity. but the job also attracts a lot of bad people who exploit their authority abuse or kill people, and there are types of politician and voter who support that kind of behavior and choose to advance it.
It doesn't need to be devastating to them but it needs to be clear and maybe it should intentionally be a bit embarrassing to them.
Still needs to be careful though as we don't want police to stop important investigations to avoid public shaming; we only want them to be very careful before going public in either way with such a case.