It's one thing if the student decides to go off-topic. It's another if the instructor does. Plus, if the instructor goes into an ad-hominem attack, like some that were quoted here, it's a pretty reasonable assumption that grades would suffer if the students didn't tread lightly.
You seem to just be assuming that instructors go into ad-hominem attacks here.
The students are free to just be assuming that they aren't allowed to disagree with the instructor which I have found is exactly opposite of true in cases where controversial topics are considered.
In my experience, it would be more likely that an instructor would defend an argument opposed to their political leanings to show how it could, and would easily be defended.
Upvote
0