According to the complaint, the defendant:
- went back to the US several time after traveling to the DPRK despite being warned not to by the US state department
- had several consensual interviews with FBI agents
- consented to a search of his phone
It's hard to read this and not think that he brought this upon himself. If you really want to do what he did, get a lawyer, don't travel back to the US, don't speak to law enforcement.