> As to your first statement, ignoring how disingenuous it is, if those standards did have a reasonable justification for applying them to inter-regional travel the fact that we do not apply those policies to inter-regional travel does not negate the justification for applying those policies on the international border. It's not binary.
So what is that justifying difference that you seem to think exists?
National sovereignty, which historically simplifies to war-time allegiance. This is a common classification for governments of nation-states imposing travel restrictions. Are you asking if it's justified?
So what is that justifying difference that you seem to think exists?