I have no idea, nor do you.
Politically, the huge population boom following the losses of the Iran/Iraq War has created a large population of young people that do not share the radical views of those currently in power. This is in sharp contrast to the bored and unemployed youth population of Saudi Arabia that is becoming more radical then the sedate ruling generation. That's a powder keg.
Iran is a potential problem, and has been since we disrupted their government in the fifties. This does not answer the question of what they have to do with the 911 picture you posted.
Some of us like judging the situation with facts, not hype or emotional ploys.
And for the thousandth time, why isn't everyone pissed about Sudan?