As part of trying to understand why I get pulled over so much I've straight up asked cops and police chiefs why they pulled me over so much. And they say this.
For the most part, cops hate this system! It doesn't exist because cops like the arrest and ticket metrics. It exists because voters elect people that put ticket and arrest quotas on cops.
And because city budgets live on the revenue from tickets and court fees.
And this explains why cops can't solve crimes in Black neighborhoods...