This is a double dose of inhumanity: the first documentary is about the unsolved disappearance of two men believed to have been a double murder; the second is about a burglar who punctuated his night time lootings with rape.
In Michigan, brothers Donald and Raymond Duvall got into an altercation with two men out hunting. It ended with them being beaten to death then fed to the pigs. The Duvalls would almost certainly have gotten away with this senseless crime if they hadn't boasted about it in their drinking den. There were other witnesses but apart from one woman, they were if not participants then complicit bystanders.
Considering the time it took to bring the case to trial, conviction was by no means certain, and it is quite likely their conviction was due as much to their character and reputation as to actual evidence.
The case of serial rapist Paul Robinson is more interesting, partly because we hear from two of his victims, one of whom reveals her identity and faces the camera. The other reason is that at the time there was a six year statute of limitations on prosecuting rape in California. Thanks primarily to the lies and duplicity of the odious Gloria Allred, this has now been totally abolished, so a demented female can come forward and claim to have been raped ten, twenty, thirty and more years ago as in the UK. However, while there should most definitely be a statute of limitations for reporting rape, there is no reason for there to be any limitation on its prosecution. The cases discussed here were all reported promptly and there was physical evidence. This is an entirely different proposition from historical reports, most of which are false, some demonstrably so.
In the Robinson case, the authorities managed to get round the statute of limitations by using something called a John Doe warrant, in particular the warrant was issued against the unknown individual whose DNA was found at the crime scenes rather than against Robinson as a named individual. He was convicted of five felony sexual assaults, and in 2010, nine years after this documentary was aired, the Supreme Court of California upheld his conviction.
It should be noted that Robinson was known as the Second Story Rapist - storey in proper English! The Flashlight Rapist was a man named Joseph Cave.