Or the lack of limits to your credulity.
Since your imagination stretches so much further than mine, how about you list some legitimate (non-Jihad supporting) reasons for Americans to spend a lot of time in Lebanon. Remember these reasons need to be able to account for a good portion of 25,000 people.
Let's see, I'll get you started. Some could be there for legitimate (non-Jihad supporting) work. That should account for a few dozen. Others might be there for a short vacation, and just got there at the wrong time. That should be a few dozen more.
Well, that still leaves almost 25,000 to go. How do you account for them?
Beyond that ... I'm not the one accusing folks of malfeasance. You are; you bear the burden of proof. Thus far, the burden has crushed you.