Maybe fun is about not wanting to get 'busted' or 'in trouble'.
Taking a look at all current and past 'cultures' with their sets of ideologies, what would have been 'fun' for those 'cultures'? What would have stepped outside of their own 'moral' rules/laws?
An example: Before the Unification of the Islands of Hawaii, it was 'wrong', morally wrong, for men and women to 'dine' together. Both the males and females had their own 'houses', or hale(s) (pronounced; hah-leh) to eat/dine within. But after King Kamehameha the First's death, this 'kapu' or 'taboo', was abolished.
Did what was once 'taboo/kapu' become 'fun'?
Kapu is the ancient Hawaiian code of conduct of laws and regulations. The kapu system was universal in lifestyle, gender roles, politics and religion. An offense that was kapu was often a capital offense, but also often denoted a threat to spiritual power, or theft of mana. Kapus were strictly enforced. Breaking one, even unintentionally, often meant immediate death, Koʻo kapu. The concept is related to taboo and the tapu or tabu found in other Polynesian cultures. The Hawaiian word kapu is usually translated to English as "forbidden", though it also carries the meanings of "keep out", "no trespassing", "sacred", "consecrated", or "holy".
The opposite of kapu is noa, meaning "common" or "free".
In the wake of inconsistencies of judgment, necromancers and other practitioners of the magic arts were able to utilize spells featuring holy
names with impunity,
exemption from punishment or freedom from the injurious consequences of an action.
Proverbs 29:18 "Where there is no vision, the people perish: but he that keepeth the law, happy is he."
Was it ever 'taboo' or morally wrong to be a necromancer?