So when we put our noses into their business we cannot wash our hands of the things that contributed to the problem in the first place.
Sounds like you are justifying terrorism in general and 9/11 specifically.
Bin Laden's gripe with the US was because of American troops in Saudi Arabia. Troops stationed there at the request of Saudi Arabia. Why? Because they were scared of Iraq invading their country and they lacked the means to defend it. Now that 9/11 cannot be undone, Bin Laden has to use Islam and the other generic anti-American rhetoric to keep his cause going (and his butt alive).