how are people still living there is also a question

(and the entire county, but I digress - first case: 4 murders, and an Incest Murder-Suicide, second case: three murders, a suicide, and an old accident long thought to have been a suicide

It's like why does no one suspect Jessica Fletcher of being a serial killer, or how is anyone in New York City after your average Spider novel. Either they're dumb or it's plot armor, because you'd think people would leave rather than risk living in Murdershire.

Maybe everywhere else is worse.