You're making an amazing effort to dream up new worst-case scenarios that could justify the speediest, least hesitant response. Great imagination and creativity, but you're violating Occam's razor by multiplying entities, ie inventing new facts to rationalize an illogical position. Yeah, maybe the murder could have taken place and the neighbors would be unaware of it because it occurred in an almost soundproof basement, but how do you know the house even has a basement?

Sure, you want to get police into position as quickly as possible, but you can also direct other people to investigate at the same time. And instead of just yelling directions at the guy from a distance when he came to the door, they could have tried asking questions when he appeared.

I mean, you can just as easily imagine other non-threatening factors. What if it was real, but the person at the door was actually one of the hostages who had been released but was scared and disoriented? What if it was an innocent person who was deaf? Police in Oklahoma shot a deaf guy 3 months ago even though people were yelling at the officers to tell them he was deaf. Police know what swatting is, and it's a common enough term that newscasters can use it in a sentence these days, so why didn't they consider that possibility?

I realize you're trying to be objective, but almost every one of your posts on this subject actually depends on a logical fallacy.