Teachers have little Freedom, instead they must teach the curriculum and this teacher was far off the science curriculum.
However, if you want teachers to have freedom in the classroom, I am sure there are many liberals teaching civics and history that can pontificate on the greatness of Communism of how George W. Bush is a War Criminal.
Fact is from the reports I have read we don't KNOW how this teacher spent his time, at least not in detail. Did he simply railed on about nothing else except Palnned Parenthood? As an occasional aside certainly there is nothing wrong with this. Many a teacher will thrown in an obiter dicta into a class discussion if only to kill time.
Teaching the social and political foundations of the science is valid, even brilliant.
Something the dim bulbs of bureaucracy cannot comprehend.