Math ed shows human flaws in a harsh light without delay. This includes social flaws such as fads and aversion to Peano Axioms or Fractions as Functions.
The truly irrational resistance to the math behind elementary math shows how group social dynamics can prevent even the profession of teaching math learning the math they are trying to teach. The DK Effect contributes to this, but it takes a system of villages to maintain such irrationality for over 150 years, measuring from Grassmann 1861.
Any market can stay stupid longer than you have patience or money applies to math ed and not just the stock market. Pick your dysfunction pond and swim in it.