I don't think we should do either (understand or label them) - I think we should just make them dead.
We need to understand the terrorist in order to more efficiently kill them.
Know thy enemy.
If you do not know your enemies motives, you can not reliably predict his actions.
Of course Clowny’s motivation in his film is not to promote knowledge of the terrorist motives in killing themselves and their victims but to promote sympathy for the terrorist and his cause.
The guy is a traitor to his country.
Yes. Make them dead, no nasty labelling. Although a little tag pinned on the big toe might be okay for a short while.