While the @ss in London says it's Western Policy, other's have another idea:
Central to its ideology is the
reintroduction of the caliphate, an Islamic state governed by sharia law that would stretch across all formerly Muslim lands, taking in Spain, Morocco, north Africa, Albania, Turkey, Saudi Arabia and the Middle East, as well as Pakistan, Indonesia and the Philippines. Plenty on the left tend to skim over this stuff, dismissing it as weird, obscurantist nonsense - and imagining it as somehow secondary to al-Qaida's anti-imperialist mission.
That's a big mistake. For it is this animating idea which helps to explain al-Qaida actions that otherwise make no sense. Why did the Madrid cell that staged last March's train bombings continue to plan attacks, even after Spain's new government had begun withdrawing from Iraq? Perhaps because al-Qaida wants to recapture at least part of Spain for Islamist rule. Why did it bomb a nightclub in Bali? Partly to attack western tourists, of course. (Taylor says the bombers thought the clubbers would be American, not Australian.) But its chief aim was to destabilise Indonesia, which it wants to place under Islamist rule as part of the yearned-for caliphate.
In other words, al-Qaida has a programme that predates and goes beyond Iraq. It seeks to end all western presence in those lands it deems Islamic.That's why it has, over the years, targeted France and Germany as well as the US and the UK. When Tony Blair asks "What was September 11 the reprisal for?" he should know the answer. It was for eight decades of US-led, western meddling in territory that al-Qaida believes should be Muslims' alone.
This is the ideology that defines al-Qaida and which explains why it was in business from 1993 and not just 2001 and after. Tellingly, those who monitor Islamism in Britain say the big surge in growth of extremist groups came not after 9/11 or Iraq but in the mid-1990s - with Bosnia serving as the recruiting sergeant. In the same period Chechnya, Kosovo and Israel-Palestine all came into play - again predating Iraq.
In regards to that last little bit - who's side were we on in Bosnia? I'll give you a hint, we weren't killing Muslims. Someone care to explain how we angered them THEN when we were fighting on their side? I don't get it, but I'm slow that way.
H/t Pull on Superman's cape who quoted the exact same Guardianpiece, but I loved it so much I had to paste it here too.