[dekrg]

Prepare to be surprised then as optional IDs are pretty much only a thing western countries.

https://en.wikipedia.org/wiki/List_of_national_identity_card...

https://en.wikipedia.org/wiki/National_identity_cards_in_the...

[Tomte]

Bad reference. Again Germany: it's colored red, but the table clearly states that you don't need to carry it.

Which is the statement you tried to counter with your link.

[TomMarius]

Yeah, you need to have it, but you don't need to carry it, nor show it to anyone (including the police - they're supposed to use other method of identification if you refuse).