Give power of life and death over others in an environment were they de facto are judged less strictly and punished less strongly than other people, to people with 3 weeks training.
If only it was a question of "3 weeks training". The real brain rot of being a police officer happens as you're jumped into the street gang that is your local sheriff's deputy division.
Its a real Learn By Doing situation. And what cops learn over time is that they are utterly unaccountable save to their immediate superiors, who all have their own political and financial agendas that diverge starkly from the ostensible job of policing.
3 weeks? It's more like 20 weeks, which yes, is low compared to other countries. I have two friends who are cops and they went through 20-25 weeks of training before they ever went on patrol, and then it was with an experienced partner. I'm not sure what academy is doing 3 weeks of training, but yikes.