“A large proportion of the Cambodian people have mental problems because their family members were lost and their spirits damaged. These factors are one of the major causes of the poverty that plagues Cambodia today.”
i would imagine that the complete eradication of the professional classes, leaving nothing but ignorant, uneducated peasants and the leveling of infrastructure to the stone age level played a bigger part ...
Same sort of things plagues China to this day.
Decades of murder, famine, insanity imposed by their government.