Economic and Political thought are part of all education, even if only presented tacitly.

Agree and disagree. A distant relative was someone who had to flee a communist country because he was deemed an "enemy" for being a businessman or shopkeeper. Apart from North Korea, which countries actually prohibit entrepeneurship these days? Even Vietnam has moved towards a market economy and enterprise. I'd say propagating the teachings of someone like Mao or Stalin (both terrorists for what they did in the past, imho) is abhorrent and plain evil.

If there are perimeters on the content of speech in the classroom.. that's scary.

When it comes to religious fundamentalism like ISIS, right wing christian groups, and extreme ideologies like communism and nazism then there should be.