In this situation, I'm sure the cops knowing he was maybe on drugs and acting strangely just assumed he was possibly unstable and either didn't care to go the extra distance not kill him or are simply so callous from dealing with doped up ghetto dirt bags everyday they thought they were doing the city of Vegas a flavor.
as others have said, *if* they honestly thought he was that high and dangerous, and used these tactics, and had this cop being the front man, ifn i lived in vegas, id be very afraid for my family...