Police brutality is almost universal, it's on the rise across the western world particularly in the anglosphere. It's something that rises with police militarization too. I don't have the brain to pull all the stats right now but this wiki article should illustrate it's systemic in nature and that making it a problem of individuals doesn't make sense. The fact that there are countries without cases either suggests that those cases go unreported or that those countries have solved at least the murder aspect of the issue. In cases like Switzerland I think it's fair to say the police just don't murder people there by virtue that free speech is honored in Switzerland and researchers would know if they did. Though I assure other expressions of domination and brutality beyond murder do occur in Switzerland, even if only abstractly in some cases.
It's important to recognize that these statistics are far from perfect and most cases of police brutality in countries like America go unreported due to both a corrupt judicial system and the inability of economically disadvantaged victims from being able to hire legal defense.
So we must ask. Why is police brutality systemic? In answering this question we seek another question. What is the purpose of the police? The purpose of the police is to protect property rights. In America specifically, modern police departments evolved to both enforce slavery and keep war with Native Americans. They simply didn't exist beforehand.
If anyone desires to do their own research they'll learn that the police in other countries often evolved out of the need to protect Crown holdings and or the property of the rich. In the American context the Africans forced into slavery were the property as were the land and resources of the Natives. In our modern context the property is business, means of production, etc. You'll notice in riot situations (barring cases of opposed groups of rioters [nazis vs reds]) that human to human violence doesn't generally start until the police show up and start kicking people's teeth in. The police don't go to riots to protect people from people, they go there to protect property from people. This relationship is explicit too in the ballooning police budgets in America funded disproportionately from both taxation they enforce and petty "crime" ticketing targeted at low income citizens. In other words, the police are the mafia and for that matter, so is the state.
In any case these relationships of property for the purpose of extraction, which they all have in common, are inorganic and upheld by the armed goons of the state, the police. Of note that in countries like America a network of oligopolies like Amazon and Lockeed control the state through lobbying where the state just becomes another arm of corporate control showing clearly the purpose of the police even more. In absence of the police people wouldn't tolerate the accumulation of goods, land and control of industry that the rich hold, they would organically and rightfully seize them for collective use. The commons would return and we would embrace them.
How do we handle domestic conflict in absence of police? Simple, non-police emergency numbers with community care workers. Stronger empathetic communities in general. In cases of genuine community self-defence like with shootings, a well trained community militia that doesn't fetishise their weapons. More importantly communities who have developed these 3 characteristics will find cases if grotesque crime massively diminished.
I'm not interested in being governed by something that isn't human and most other people aren't either. AI is a tool not a lord. The issue isn't that people are some Hobbsian beast that needs to be controlled. The issue is that humans are self-determined empathetic beings that are caught up in material conditions grander than themselves as individuals. These material conditions inform the world we have today as much as we as humans through cultural expression inform them. The solutions to our conflicts are not more domination. There was a time before police, as unimaginable as this is to most today, and there will be a time after them.