This couple that was in the same train as me, left their seats to change the diaper of their little baby.
Not only did they go away from their luggage, but they left two phones and a large tablet visible and unattended for quite some time!
Denmark is an extremely high trust society. Babies left in the carriage outside a shop, let yourself into the library after hours with your card, often things on the street that are for sale you can just take and mobile pay (like Venmo but from the government) someone on the honor policy.
It's nice