My theory on the general nature of the "root cause"? Fear of the very idea that they don't actually matter. The fact that the lie is soon fed to them from birth doesn't change that it's bullshit.
One of my favorite lines ever in any media has got to be master Yoda explaining the danger of fear. Tied is the "litany against fear" from Dune, but the point is to teach hate, first teach fear.
It explicitly says average at the top of the graphic.
Your interpretation makes no sense anyway.