Why is it "dangerous?" If you are a foreign national residing in the US, not a citizen, you have certain expectations of behavior that US citizens get either a pass on, or are treated differently in regard to.
For example, you are a foreign national and commit a misdemeanor crime. That potentially could get you deported. A US citizen receives at most some penalty like a few days in jail or a fine. Or, if you are involved in what the government deems activities against the US, you get deported where a US citizen gets a pass as a "free speech" issue.
When the US government starts arresting the US citizen protesters and holding them without charges, etc., get back to me. THAT would be dangerous precedent.