They rose to power strictly with the use of fear and killing. The Khmer Rouge wanted people to do their bidding and be their farmers, but they really had no interest staked for the common person of Cambodia.
The Nazi regime at least started 0ut having the Germans revival as a culture in the forefront of their minds and plans. Nazi regime more or less depended on the intelligent elite to join their forces so that they could be used as pawns to spread their word.
Hope I helped!
