People with power in any system know that any human custom, behavior, or thought process can be eliminated in 3 generations.
Take human custom “X.”
“X” is outlawed during Gen 1.
Gen 1 becomes the last to experience “X.”
Gen 2 relies on the accounts of Gen 1 for their view of “X.”
Gen 1 says:
“X was overrated.”
“I don’t really miss X’ing at all.”
“Your mother and I X’ed, but that was another time.”
Gen 2 knows only the context of illegal or outmoded “X.”
Gen 3 never X’es or knows anyone firsthand who X’ed.
Most of Gen 3 is afraid of or apathetic to X. A few will try it, but X now always will be fringe.
Gen 1 completely dies off during Gen 3.
By the end of Gen 3, no one alive remembers life with X.
By Gen 4, X is a distant memory, relegated to blithe nostalgia, or designated with no resistance for outright erasure.