I feel bad for Goto. I've read he got caught up in this trying to save Yukawa.
Yukawa has been asking for this for some years. Western news is not giving the complete picture of him. He's not a threat mind you. Just, he is nuts and has been getting passed around from IS to Al-Qaida, back and forth cause they get rid of him and he keeps coming back. Shits been going on for a few years now. He claims to be Muslim.
If they get him back they need to put him in lock down in a mental hospital until he gets his head in order. He keeps sneaking out of Japan and makes his way to Iraq or Syria. If he's a spy he's the Johnny English of spies...
The self-mutilation part is grisly. He chopped off his own cock.