This absolutely depends on the agency/situation.

My agency used to rate our agents based on the amount of cases that led to convictions. Years back, we recognized that disproving an allegation was equally worthwhile, and settings promotions/evaluations based on "proving or disproving" the allegation was much more objectively reasonable than focusing strictly on convictions. There is still a reference to case completion speed, value of recovered money/property, and conviction results (providing a thorough enough investigation that the suspect is convicted for X years, for example), but disproving an allegation or proving that a different person committed the crime is far more appreciable to the agency.

We're fortunate in that we are a federal agency, instead of local/state level, where they can be significantly more busy with countless lesser offenses, while still running some extremely high-profile stuff, but I think it would be a huge boon to law enforcement if states mandated an approach focused on this objective metric that isn't strictly on "getting him".