Because here are many non-USA citizens on HN who travel to USA for work, conferences, business meetings etc. and are concerned that one day it might happen to them too?
https://travel.state.gov/content/passports/en/alertswarnings...
https://en.wikipedia.org/wiki/Visa_policy_of_Iran#Admission_...
- Admission is refused to holders of passports or travel documents containing a visa/stamp for Israel Israel or any data that passenger has been to Israel or indication of any connection with the State of Israel.
http://www.bordersofadventure.com/travel-to-iran-things-to-k...
- All US passport holders are only allowed into Iran if part of a tour group (or with a guide). It apparently still stands that Americans must also be escorted from the airport to the hotel, and cannot make their own arrangements (it all has to be pre-organised – a simple addition via a tour company).
https://www.washingtonpost.com/world/national-security/anoth...
http://www.npr.org/2016/07/27/487665607/with-3-u-s-citizens-...
A person with a federal warrant was arrested entering the USA. Why is this hacker news?
If you want to discuss "what might happen" when entering a country, and the entry laws of those countries, I'm game. But again, I don't see how it is tech related.