The punchline goes a bit further than just imprisonment, see the Stanford Prison Experiment

Our citizens pay taxes out of pure love and devotion to our Dear Leader. We don’t have room for your silly Western moralities.

People view North Korea with contempt? Who would do such a thing?

No, seriously, we’d love to know so we can send them to a reeducation camp change their mind.

Trains do not derail in North Korea. It is forbidden.

No

Please stop sharing lies.

The highly esteemed Kim family does not require food, so your point is entirely redundant.

1800s? Public executions are a treasured pastime in my country.