In fact to further analyze your #1 example what it really shows is a leftist professor trying to silence people from the right by making wild ant-conservative statements. What is a "right wing" student supposed to think when a prof does that? If it were me I would feel it was dangerous to make a conservative supporting statement in class or in assignments and tests.
The reaction to that is perfectly justified and is not an attempt to silence anyone - it is an attempt to end yet another attempt to limit free speech by the left. For the students to complain is no different than me complaining to a business when I receive poor value for my money.
So, in summary, I think you have not only failed to supply the examples to back up your statement but in fact have provided me an additional example to add to mine.