There's nothing oppressive about combatting error. It's an act of charity.
Unless you believe that fascism serves the common good.
No, but the free flow of ideas certainly serves the common good.
Sometimes it does, sometimes it doesn't. Do commie professors serve the common good?
Unlike you, I don't trust the state enough to give it the power to decide what ideologies are "correct" and which ones are not.
That's a healthy fear. And overall, free political speech is probably a good idea. Despotic regimes generally haven't come to power in "free" societies. And yet, serious problems remain. In our country, we murder 1.3 million unborn children every year. A dubious achievement of a "free society," to say the least. Obviously, it's a free society for a protected class of people.
Nanny-statism of the highest order.
Do commie professors serve the common good?
Yes. Their views are a part of the marketplace of ideas. Adults should be allowed to decide for themselves whether those ideas hold any merit. Such a decision is not up to the state.