So maybe you’re not familiar with churn then. Churn is the turn over rate for employees. I also think you misunderstand what reformation means, how long it takes, and that there’s no tipping point of when something is reformed or not. It wasn’t magically Roman Catholicism to Lutheranism after Luther penned the 95 Theses lol.
You already said that civil rights have gotten better.
You already agreed there are new laws and increased oversight regularly.
Employees turn over as there is natural churn. Combined with churn from increased oversight and scrutiny preventing bad people or stopping heinous shit. You also have lawsuits and criminal proceedings to get rid of bad police.
How do you propose 1 works without 2 and 3? How do you posit that police aren’t better almost year by year if the entire bushel is spoiled?