You do realize you're comparing the present day United States law enforcement with Rwandean tribes, Mexican narco-terrorists and the middle ages?
Until recently America had child labor and would lynch black people. A FEDERAL judge in my hometown of New Orleans is famous for saying "We like to try our niggers before we hang them".
Human nature is human nature.
We live in a 'veneer' of civilization.
Underneath are still the same old animal instincts honed over millions of years of evolution.
Don't ever forget that. Or forget it at your peril.
Yes, they are all members of the same species. "Humanity" is a thin veneer over the top of a very selfish, very violent animal.
It's a very, very sad state of affairs when you have to compare a developed country to undeveloped ones.
United States law enforcement included, as described in the article.