So why didn't the police consider him a threat? Because they didn't bother to watch the videos. They "were aware he had posted disturbing videos but never viewed them before or after determining he was not a threat to himself or others, the department disclosed Thursday.")
"According to the statement from the sheriff's office, four deputies, a police officer and a dispatcher in training were sent to Rodger's apartment after being informed by the county's mental health hotline that Rodger's therapist and mother were concerned about videos he posted online."
Have you ever had "four deputies, a police officer and a dispatcher in training" show up at your door? I haven't. Sending 6 (six) LEOs out suggests that at least somebody was taking the threat very seriously. Which, as was eventually shown, was the correct interpretation of the facts.)
Two Deputies were dispatched, the dispatcher was on a ride-along, not sure what the campus cop’s reason was, but the other two deputies were the one’s who’d handled the candle theft case and tagged along on their own. It’s not uncommon for someone who’s had previous experience with the occupants of a residence to go along in case their background info or prior knowledge of the “player” can be of use.