The Taliban didn't start this war, the US did.
The US shelters criminals all over the world, including their own backyard. There is no one to blame for the war but the US themselves.
Short answer.. Perhaps they didnt start it directly, but they could have prevented it, or have ended it. Instead they choose to fight. They facilitated the likes of Al qaeda and provided them sanctuary. Thus they were accessory to the crime.
I dont know which criminals your refering to specifically. The US does shelter criminals in maximum security prisons, but that isnt what your refering to I believe..
The US did what it had to. Any country that is attacked in such a manner would react the same way. And quite frankly, a regime like the Taliban dont deserve to exist. Their downfall was a serendipitous event, in that the Taliban could be toppled while taking out the real enemy, which is Al Qaeda.