Documentaries are often slanted and designed to lead the watcher to a conclusion. The watcher assumes they are getting all the information in an unbiased format. They usually aren't. I was at one point for a couple years assigned to a Missing Persons unit while I was a Detective. After watching the episodes I don't have enough information to conclude anything but that he disappeared. One of the witnesses said during the series interview that shortly before the husband went missing he was working with him on the property and the husband said something like "If I can pull this off it will be the greatest thing I've ever done". He never finished the thought. The witness certainly wasn't a fan of Carols so it's not likely he would make it up to cover for her. I do agree the documentary wants us to think she did it. She might have, but he might have faked his death as well.
Wait you mean an entertainment based medium isnt truthful and has underlying motives?
Its good we have CNN, MSNBC and FOX NEWS to feed us unbiased truth. And the internet.
As for the husband why would he have faked his death so the wife could wait 5 years, claim his fortune and remarry 3 months later?
I guess it makes sense if he hated his adult children so much that he wanted to see them suffer, thinking he was dead .