My brother-in-law told me that when he and his brothers and friends were getting into D&D, their father only had one rule. They had to play Good aligned characters. If anyone was caught playing Neutral or lower...that kid was banned from the game.
Just a little background...in his teenage years, before the vietnam war...my father-in-law was aspiring to become a Baptist preacher. So you can see where he was coming from.
I think that rule of his is a good one for children.
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