Why are you so gung-ho about such a pathetic standard? The US shouldn't be terrified of students expressing contrary ideas, it should show them that we mean it

Why are you so gung-ho about such a pathetic standard? The US shouldn't be terrified of students expressing contrary ideas, it should show them that we mean it when we say that freedom of speech is an important value. It can well be the case that the visa has provisions that allow rescinding it for the things that you are talking about, but I'm pretty sure that they are discretionary, not mandatory, so no need to cower at the words of these students.