I mean, illegally obtained evidence is still evidence. I don't think it's absurd to think police want to convict as many guilty criminals as possible, particularly if the crime is heinous enough to justify risking their own jobs by breaking the law to get evidence.
When we no longer have elected police, sherrifs, or district attorneys, then the numbers won't matter as much as the severity or sensationality of the crimes investigated.
But if the numbers = tough on crime, then there is pressure to obtain evidence illegally. If it becomes pervasive, then investigating the misconduct will never be prioritized because it doesn't seem as impressive to the voting public, and furthermore the justice system very rarely goes after their own.
So it's good there's a consequence for not walking a fine line; it's the embarassament of having your work undone.
