>When I said "left alone" I mean alone. I didn't mean "leave them in the house with other people".

So now you're opening the door for the knife wielder to flee or to end their own life. Then the same people who are already vilifying the police would be angry that the cops stood by and did nothing. You're also assuming that there wasn't anyone involved that wasn't able to flee from the guy with the knife. What next, the person that called 911 gets called a murderer too? Let's make calling 911 illegal, that'll fix it for sure.

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>it was very clear that the Proud Boys were rolling in there nightly

Oh fuck off with that shit. They had nothing to do with the shooting incident with the two teens in the stolen SUV.