The
stated motive behind 9/11 was the Sanctions imposed on Iraq (with negative humanitarian consequences); the presence of US troops in Saudi Arabia (which is a problem because Saudi Arabia has some of the holiest sites for Islam, such as Mecca and Medina) and US support for Israel (whose existence was considered a problem in itself). It is clear therefore that US foreign policy provided justifications [
according to Al-qaeda] for them to attack the US.
[Full Text of Osama Bin Laden's "
Letter to America"]
The US has a long history of supporting dictatorships which serve their interests for strategic purposes, and there is suggestion that the
CIA had links with Al-qaeda in the Soviet War in Afghanistan. The covert nature of these relationships means of course that hard evidence is difficult to come by. It would be wrong to say that radical islam was 'created' by the US as it developed out of regional conflicts, but US intervention certianly would have played a role.
I think there is very little the US can do as you simply cannot force a nation, or a region, to be 'free' or to adopt more western values, as these things take time to develop spontaneously as they have done in many regions around the world. The disaster of the Iraq invasion was based on a radical over-estimation of the US's ability to change a nation by invading it and imposing democratic values by force. I find it difficult to believe that ISIS could have developed without the US making such a catastrophic error of judgement as to invade Iraq. After 9/11 the Taliban, eqivilent to local warlords in afghanistan, offered to hand Bin Laden over to the US as they didn't want him and were not involved in 9/11. After the US invaded, it became a question of the taliban defending there own communities and so Retrospectively, this could well have saved the US from invading afghanistan
if this offer was serious. A more cautious foreign policy response to 9/11
may well have saved the US from becoming involved in two wars, and not screwed up relations with Muslims. But even
Al Gore would have invaded Iraq.
Under Obama, thing have been 'quieter', but rather than large scale invasions, we've had widespread use of Drone strikes. This is 'better' from the US view as it does not entail having people on the ground as the drone can be remotely controlled, but for the people on the ground- it underlines the pervasiveness of US power in a way that kind of reduces people to chicken little; "the sky is falling and trying to kill us"
The ultimate goal of radical Islam is the establishment of Islamic and a Caliphate, and that involves drastically redrawing the map of the Middle East; the US basically has to pick sides and goes with the status quo, often with a view that it is "better the devil you know". The radicalism of US foreign policy, whether it is neo-conservative spreading freedom and democracy or a humanitarian intervention in terms of human rights, has different justifications but ultimately with the same result.
The US could cut back it's involvement in the Middle East- but we are trying to chose between the lesser of two evils here. No outcome- unless the US flipped and decided it's goal was the full democraticisation of the middle east which is a) political sucicide and b) known as "world war III"- would fit with American values. it sounds like a "war is peace" paradox in that the US cannot uninvent radical Islam and have a peace of it's own design, but at the same time can't go to war with it without the risk of strengthening it as may well have happened with ISIS.