Who is at fault for the BP oil spill?

I think that the BP corporation should take full responsibility for what happened int he gulf last year. For the most part it was a chain of reactions that triggered it more than it was just BP's fault. It was humanity that created the well, it was humanity that made the design flaw, it was humanity that made the oil spill and spread everywhere which effected all the animals and environment. It may of been avoided by the BP crew that was currently on the rig, It may have also been avoided if the BP architects made the machine actually work. A lot could of happened for the spill to be avoided, but we were asking for a problem by trying to mess with environment juts for some oil. If we could think of new renewable energy sources or at least think of safer ways to get the oil in the ground, we could save many animals from a painful death.