Tell me, who created Taliban for fighting against Russia in Afghanistan, which country helped them with weapons, have you realized anything.? This is all about colonialism.
I also consider that some Muslim are heavily responsible for occuring anti human work, but you should not blame any religion. Every religion show us to the way of beautiful meaning of Life and peace.
So what the US shouldn't have helped the muhadeen? They sold them guns and trained the so that they could defend their country from aggressors. There is nothing wrong with that.