The USA interfered with the middle east essentially since the end of the second world war. There were several generation since then and it seems not unreasonabl

The USA interfered with the middle east essentially since the end of the second world war. There were several generation since then and it seems not unreasonable that their motivation is based in different events. While the motivation for 9/11 and earlier attacks certainly did not come from the last war in Iraq or Afghanistan, this does not rule out that the current generation is not significantly motivated by those. It quickly becomes a rather philosophical question how many steps you want to go back in the chain of events in order to pick one as the cause.