>The tour group celebrated New Year's Eve by carousing in Pyongyang's Kim Il-sung Square before returning to their accommodations at the Yanggakdo International Hotel, where they continued drinking alcohol. Early in the morning of New Year's Day, Warmbier allegedly tried to steal a propaganda poster from a staff-only area of the hotel.
He stole a poster. [1] In North Korea. It was young and stupid and he shouldn't died for it, but he did break a law while he was over there.
[1] https://globalnews.ca/video/3544639/video-appearing-to-show-...
How are we certain that he did in fact steal the poster? For all we know he could have been entirely innocent and any other tourist could have been arrested and tortured for forged reasons too.