It seems like an increasing number of people believe 9/11 was an inside job?

I like to look at who has what to gain with these events. And looking at this from a neutral perspective, I see nothing that a middle eastern Arab nation or terrorist group would have to gain from this event. Massive destabilization, US occupation, hiding in caves hoping not be killed by the US military? Sounds awesome! What the US had to gain? Well, I think that should be pretty self evident at this point