It was sarcastic of me to say: “Good thing you didn’t need to intervene, somebody could have been hurt!”. Somebody should have intervened, and because nobody did, somebody was killed.
So if they seem to have no problem doing something wrong, the public should make it easier for them? I can tell you from personal experience that cops sometimes have drastic problems with trying to control some situations. But it’s a sticky risk assessment. Is it safer letting a group kill with impunity, or trying to stop them? They are both insanely risky. But at least the latter is taking responsibility with something pro-active. Also, the public greatly outnumbers the police, so there is an advantage.
…after all, it doesn’t sound as if you expect anybody else to voluntarily fix the problem.
For police departments to even exist at all, there must be some societal consensus that social stability can be more important than an individual’s life.
Anyway, there is some “stake”. Somebody in your community is being paid, with your money, to kill another member of your community. So it implicates everybody, whether they want it to or not. If OTOH you think that it is merely “imagined community”, some abstract construct you don’t care about, then why be obligated to a government anyway? But if they exist, and they affect you, then it seems worthwhile to demand accountability to go both ways. This takes some force and resolve to make happen.
If you accept, in theory and/or daily life, that accountability is one-way - this basically tells the world that is rule by fiat, that nobody can expect to be treated fairly, nor do anything about it. Doesn’t sound practical to me.