It’s not quite as satisfying as the human indulgence for the visceral, but Pope John Paul II had the measure of things, much more than US politicians of any stripe at the time:
International cooperation in the fight against terrorist activities must also include a courageous and resolute political, diplomatic and economic commitment to relieving situations of oppression and marginalization which facilitate the designs of terrorists. The recruitment of terrorists in fact is easier in situations where rights are trampled upon and injustices tolerated over a long period of time.