About as many as bad terrorist groups that began due to catastrophically bad decisions of leaders in the West. I'm sorry to break it to you - the plural you - but all the terrorists that are not traditionally domestic (local leftist/rightist extremists are everywhere, after all) - and the fact they are against the West - is simply a consequence of Western politics. Imperialism and neocollonialism are real, actual policies, and it doesn't take a genius to realize that. If such policies hit locales where it's not culturally wrong to die for a cause, it's obvious you'll get terrorists after a while. I suspect this was calculated risk until it stopped being that: the locals got their own exploding sticks and decided to use them.

It's so incredibly sad to watch: for decades, tons of people made mostly rational (from their point of view) decisions, yet each step inevitably brought us closer and closer to the current situation. Add a few cultural, social, and personal pathological cases into the mix, and what you have is basically a speedrun to 9/11.

Note that I'm not justifying terror attacks, just saying they are a very predictable consequence of decades of policy-making.