Why?

I believe college education severs the instinctive common touch that most people retain into adulthood. When one feels that one has ascended to upper class status, because one is now better educated than the average person, one's natural corruptibility to seeking unearned power kicks in, and one feels righteous, even entitled to boss other around, deprive them of their wealth, their dignity, their liberty, and their power.

Such processes of bullying, exploitation, abuse, and oppression are often regular in caste society. Once the educated young person is elevated into the elite class, then his heart hardens, and he becomes one of the rulers. Then he turns mean, even cruel to those suffering under his reign, and he feels no pity to their outcries and pleading for help. Indeed, he wears his obstinacy and pitilessness as badges of honor.

Only among equals is mercy more common, so obviously a just society will not be very stratified.

Along comes Jordan Peterson with daunting evidence that hierarchical society is 350 million years old, and naturally a few by competence rise to the top and every hierarchy, and most do little at the bottom.

Now hierarchies turn corrupt, but only artificially established, and formulated populations of elitist common people, the superior supercitizen, upper middle class indivduator-arnarchists, are roughly equals with each other, in a classless society of all upper middle class people, and no elite can emerge to boss anyone else.