The swamp is never visited, so when Hank chose it as the best location to hide the bodies of his family, no one was surprised. Some were even heard saying, "smart lad," in the dead of night at seedy bars where the women are cheap and the liquor is an endless stream.
What none of them knew, what the Sheriff decided was best kept to himself, was the maniacal look on Hanks face when he was finally arrested. His expression would be forever burned into the memory of a sheriff who has, and knows will, see much worse, and soon.