You know well by now that that’s not what happened. No murders were excused, killings were thoroughly investigated and found not to be murder. That is what happened in practice, what you are describing only happened in your fevered imagination.
Action against them shouldn’t be based on number of complaints. It should be taken if the complaints are investigated and found to be legitimate.
You, and others in this thread, have shown that cops sometimes lie. Why is it so hard for you to understand that other people sometimes lie - especially if those people are criminals being arrested. You don’t trust cops, I get that. But it’s silly to trust them less than career criminals.