Comment by ranger_danger

Absolutely. People have already gotten in trouble with US immigration just for posting negative opinions on social media, or simply speech that the government doesn't like (see all the recent pro-Palestine protestors whose visas were cancelled). The state department/homeland/etc. can choose or not choose to let people in based on just about any criteria they want. If they find out I said something critical of the government, I could either be denied entry, or kicked out, and both have already been happening to people in the last year and a half.

Even if what they're doing isn't legal, that doesn't stop them from potentially ruining your life in the process, maybe even getting away with it.