But the police is explicitly _not_ the justice system. Courts are of course complicated, and I imagine that police would abuse such a network to arrest people

But the police is explicitly _not_ the justice system. Courts are of course complicated, and I imagine that police would abuse such a network to arrest people without means to fight back... but at the end of the day I can at least hope to be in front of a judge. And it's not like the courts are the ones doing the dystopian investigating.