Because we want our sons to understand that two plus two equals four. Not that two plus two equals four is a vile oppressive construct imposed on the oppressed by evil white skinned Westerners who were nothing but evil:
Rod Dreher has the details.
I've often said that modern education is about equipping young people with the tools needed to rationally dismiss common sense. I'd say this story goes a long way toward showing that I'm right.
In ages to come, once the terrors being built upon today finally come to fruition, and then mercifully pass, people will look back on this time as the era of educated idiots. An entire narcissistic generation whose purpose seemed to be to disprove the idea that education is all you need.