Who did 9/11? A View from Across the Pond

This event had defined the new century we are living in, more than anything else, and yet our society greatly lacks any truthful dialogue on the matter. An exrtremely absurd narrative has been at once given to us, the public. Twenty years on can we do better, can we ascertain who did it? Whoever did it is in control of the world we now live in. It has somehow generated horrible, pointless wars and maybe to stop these we first have to find the guilty culprits.