No need to twist his arm. He (my theory) did it on his own. He was very politically active and hated the govt. On the day the govt arrested his oppo-party leader and his hero, the pilot said, “That’s it!” and did it on his own. This motive was riding on top of “sudden jihad syndrome” and pushed him over the edge to taking action.
Granted crazies don't think it out but just how was taking the plane going to resolve any of Ibrahim's problems or change the government? I wouldn't. No way. No how. Who's to say he wasn't glad the wife packed her bags and he was looking forward to spending every waking moment in peace with his simulator game or some gal/guy friend? There's been zero reporting on exactly why she moved out other than they were separating. He could have been the one who initiated the divorce for all anyone knows.