I don't think anyone is stopping you from breathing air. Interstate travel is still open. I'm allowed to walk around my neighborhood. No one is requiring me to show "papers" for any of this.

I know not everyone has the same set of restrictions on them, so I'm genuinely trying to understand if I'm missing something about how other areas are behaving. I know Australia is at the "papers, please" curfew stage, and that definitely bothers me a lot, but I haven't heard of anything like that in the USA.