Why would they? What downside do they face? Cops get paid bonuses for raiding houses, they get bonuses for seizing money and valuable goods, they get bonuses for charging people with crimes. While they face almost zero consequences for abusing and extorting people, can lie with impunity, and often even get away with straight up cold blooded murder. Corruption within their organization is almost completely ignored and they hire people based on how sociopathic and unempathetic they are and enforce those traits in "training" even more because harsh draconian enforcement brings in the largest amount of money for cops and courts.

Unless you live in a community where the median income is $200K+, the primary funding for cops is through charging people with the easy crimes that they can't afford lawyers to fight, often drugs because they have massively inflated fines and fees. And the next best source of funding they have is special grants and programs which are often doles out based on how "dangerous" an area is, and killing "criminals" makes an area seem more dangerous and deserving of special funds and recognition and fancy armaments and killing toys.