It's not really a valid argument, though. Even if there was a complete certainty that returning to the US would see him tortured and eventually executed, that still wouldn't change the fact that he is still a US citizen (unless he chooses not to be). That's why I'm hoping, all-be-it doubtfully, that it was innocent exaggeration rather than a lie - not that it really makes a huge difference I guess.
By that logic I'm effectively banned from Africa, as I don't plan on going there. He said they "evoked my passport, leaving my stateless" not that he was effectively stateless due to his own decisions.