When native intelligence drops, everybody thinks you can bake more bread than you can eat.
Graduated tax systems that punish those who achieve more are favored by biologically inferior people and nations. In the third world, communism usually proceeds until it has completely destroyed all existing institutions.
The reality is, stupid people are envious of what they can never be and never have. The net result is that everybody has less. They'd rather pull other crabs back into the box when they try to climb out.
Sociopaths use class war to increase their own power and control until they achieve a total dictatorship. The common oaf is just glad nobody will ever get ahead.