Yeah most of what you say makes sense especially the final bit. Why was America attacked? One answer is to say it was perfomed by terrorists who aren't bound by normal rules of logic. That isn't very satisfactory though. The best answers (IMO anyway) are 1) The US were/are seen as a genuine enemy of these guys because of their presence in Saudi Arabia and support for Israel and 2) An attack that big was going to attract supporters to them. I do think it is fair to say that the pay offs were nowhere near the cost for Al Qaeda but acts of terrorism often fall into that category. Those guys have a track record in it themselves. What was the bomb planted in the WTC in the 90s going to achieve? Bugger all but it's the symbolism that is important to these guys. There were much better strategic targets but they gave up the element of surprise to attack office buildings. As it was they were lucky to get off the Pentagon attack and the 4th target (Capitol? White House?) didn't happen at all.
Yes the US response was overblown - if they stuck with Afghanistan this would be pretty much all over. It only took a few weeks to overthrow the Taliban. Without the stupid distraction of Iraq they would have been in a much better position to deal with Afghanistan and mop things up there.
As for the question on Flight 93 I'm not sure what the problem is. The photos I've seen look like a plane that crashed at high speed with lots of fuel. Keep in mind it crashed in the middle of nowhere so it burnt out before anyone could get there.
Yes the US response was overblown - if they stuck with Afghanistan this would be pretty much all over. It only took a few weeks to overthrow the Taliban. Without the stupid distraction of Iraq they would have been in a much better position to deal with Afghanistan and mop things up there.
As for the question on Flight 93 I'm not sure what the problem is. The photos I've seen look like a plane that crashed at high speed with lots of fuel. Keep in mind it crashed in the middle of nowhere so it burnt out before anyone could get there.