He never should have gone to prison after the trial, (nor should the other 3)
Should have been out the back door up against the wall bang, end of story.
On the other hand, at least THIS one DID go to prison, the ones that blew up the "La Belle" Disco never did, nor did the ones who hijacked the Achille Lauro, even after we forced their plane down the Italians let them go.
International terrorism is a MILITARY affair just because they do not have tanks or uniforms does not make it any less a MILITARY operation.
It is in fact the only effective method for any one to challenge us. No military force on this planet can challenge the US on a conventional battle field and be sure of winning, leave out China, Russia, and India, and no conventional force can challenge us period, they might hurt OUR forces, but THEIRS will be destroyed and all the damage would be on THEIR home land.
100 or 200 trained "terrorists" however could destroy our society in a week or less. fewer would achieve the same result but it would take longer. And we wouldn't even know who to hit back at.