The actual thread of terrorism is so minute, that it's not worth worrying about. However, the fact that a 'war on terror' exists is what is desired (by the various parties that stand to gain with such a war). ANd it's not even just one group or org - it's a whole bunch of them, each individually acting in a self-interested way. The end result is the military industrial complex, all the federal money and various other parties, all pushing in the same direction because it benefits them.
The only real way to get around this problem is balance of power - more people need to be richer, so that on average, nobody can push their agenda better than anyone else.
In this sense, US Gov is the primary cause of and is directly responsible for nearly ALL terrorist acts in the past decades, globally.