Maybe Joe didn't have a suitable Moe Green handy to give Hunter harmless employment.
"He was banging 'em two at a time. What's the matter with you? I've got a business to run."
I don't doubt that Joe is scum, but he's been of unsound mind for a while. So has Hunter.
However, there is ONE lucid character running throughout this disgusting snuff film who just might be the REAL head of the family.