Why is set theory not taught at the outset of math education?

manpreet Best Answer 2 years ago

A beginner in math, reading Badiou, I found the following quote on set theory in Being and Event:

The axiomatization consists in fixing the usage of the relation of belonging, ∈∈, to which the entire lexicon of mathematics can finally be reduced, if one considers that equality is rather a logical symbol.

If Badiou and so many others have such high esteem for the fundamental importance of set theory, why is it not being taught at the very outset of math education? I understand Badiou is, after all, a philosopher. I am just an idiot without a teacher, wanting to comprehend.