White collar crime isn't a task for police any more than tax evasion is - those just plain aren't tasks they are meant for as opposed to public safety tasks. Which also explains why they are less funded, even without any conflicts of interest they aren't "sexy" crimes that grab attention, they all also lack urgency and thus are easily "procrastinated". Digging through records can uncover many of them and there are a lot of them.

The police in their current role only show up at the behest of warrants in those situations to search or arrest.