They all must hate their wives, children and extended famlies. But 40 million can do that to a person.
The NK’s policy is to confiscate property and imprison three generations for the sins of one.
This limits the extent to which vendettas/revenge might play out as the nuclear family is immediately reduced to the lowest class (literally termed “hostile”) and it will take many-many generations (if ever) to return to any stature.