When the parent poster advocated having his children taught by a postmodernist, I think he more accurately wants teachers who can make students think for themselves. In the US you can be successful with a boring centrist mindset, you can go to graduate school and become part of the professional/political elite and not really think too much about things. Of course some elites are brilliant thinkers but DC is not exactly a hotbed of intellectual curiosity these days, and governance suffers.

Historical study can reveal a lot about the contradictions of ideology, the gap between political rhetoric/narrative vs reality. For this reason it can be a very politically charged topic. But even boring (to outsiders) topics are hotly contested—historical study is not ultimately the cataloging of facts, is it about the analysis of change in complex systems over time.