[eqvinox]

> In the US, not disclosing a password is explicitly protected (5th amndmnt),

That's great but of exactly zero help if you're trying to travel to the US and CBP (or ICE) are staring you down. Even if they don't gulag you, they can always just reject entry for any non-citizen (and these days even some citizens it seems.)

[dmitrygr]

Any country can reject non-citizen entry, for any reason or no reason at all. In fact, part of a definition of a country is ability to practice control over its territory and who is and is not there. This necessarily includes border controls, which any country can decide to make as onerous as they please. No non-citizen of a country has any right to be present in it, except as permitted by its government, so any country if free to make it as hard as they wish to enter for non-citizens. This may not be a good idea, but control over a territory is literally part of the definition.

[eqvinox]

> Any country can reject non-citizen entry, for any reason or no reason at all. […] This necessarily includes border controls, which any country can decide to make as onerous as they please.

Or, a country could set rules that specify what they will and won't do as part of their entry controls. Just because it's a kind of an "absolute" power doesn't mean you can't still self-impose rules. The benefit being attracting more leisure and business travellers.

[dmitrygr]

Which i acknowledged with "This may not be a good idea,"