Extensive research into the causes of suicide terrorism proves Islam isn't to blame — the root of the problem is foreign military occupations.
Robert A. Pape in Foreign Policy:
Although no one wants to talk about it, 9/11 is still hurting America. That terrible day inflicted a wound of public fear that easily reopens with the smallest provocation, and it continues to bleed the United States of money, lives, and goodwill around the world. Indeed, America's response to its fear has, in turn, made Americans less safe and has inspired more threats and attacks.
In the decade since 9/11, the United States has conquered and occupied two large Muslim countries (Afghanistan and Iraq), compelled a huge Muslim army to root out a terrorist sanctuary (Pakistan), deployed thousands of Special Forces troops to numerous Muslim countries (Yemen, Somalia, Sudan, etc.), imprisoned hundreds of Muslims without recourse, and waged a massive war of ideas involving Muslim clerics to denounce violence and new institutions to bring Western norms to Muslim countries. Yet Americans still seem strangely mystified as to why some Muslims might be angry about this situation.
In a narrow sense, America is safer today than on 9/11. There has not been another attack on the same scale. U.S. defenses regarding immigration controls, airport security, and the disruption of potentially devastating domestic plots have all improved.
But in a broader sense, America has become perilously unsafe.