That's exactly what I'm not saying. These contrived examples only strengthen my view.

> sing loadly in a movie theatre.

Perfect example. Inappropriately making sounds with your mouth, not holding an illegal belief.

> express to an angry crowd the viewpoint

The issue is the context of the angry crowd, not the content of beliefs. Do you believe the US will penalize me for believing crypto currency is safe and stating that publically?

> thebigwinning sexually assaulted coworkers and stole money at their last job'

They are indeed allowed to believe that. They can't be taken to jail for holding that view of me. Now if they tried to get me fired with false evidence that would be a problem. If they caused damage to my business reputation without evidence that could result in civil damages.