How is this NOT suppression of the right to free speech? Suppression by peer pressure, and suppression by the teachers, an authority figure in the schools? All from the liberal / progressive indoctrination we already know is part and parcel of the education system.
Nancy Pelosi said: “We have to pass it, to find out what’s in it.” A Doctor called to a radio show & said: "That's the definition of a stool sample"
"Under my plan of a cap-and-trade system, electricity rates would necessarily skyrocket," Barack Obama January 2008
Just by including the term "political" distracts from the real issue.
There is such a thing as "political correctness", but not just the "liberal" one you're describing. There is right-wing/conservative "political correctness" as well, just that it is usually not called that way.
I agree that the term "political correctness" is mostly a fighting word invented by the right to smear certain left-wing claims.
But the same mechanism works the other way, just that liberals have not yet found a similarly catchy phrase yet.
There are certain things that are considered unquestionable truths by right-wingers, and dare you ever question them, they'll jump at you -- just like liberals jump at people who question their values and unquestionable truths.
"Not learning from mistakes is worse than committing mistakes. When you don't allow yourself to make mistakes, it is hard to be tolerant of others and it does not allow even God to be merciful."
I'd figure that's something most liberals wouldn't condone. It seems to me that's more of a result of the stupidity of bureaucracy than of anything wrong with liberalism.
I think in my town's case it was implemented by the school board, which is surprising given how non-liberal my town is (we went about 82% for Romney in 2012).
It annoys me.