Yeah, Diem. He and his family were totally detested by most South Vietnamese.
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Who told you that. Do you know why what we will call the North Vietnamese were forced to start action in the south several years ahead of their schedule?
Diem was so loved that those Buddhist monks set themselves on fire. One problem was that you had the Catholic Diem family ruling in a nation of mostly non-Catholics. Think we would have been stupid enough to install a Christian ruler in Afghanistan? Of course not.