i`ve seen one link in which a b.p. spokesman indicated that it was caused by a failed piece of equipment...and he doesn`t know why the equipment failed...
other than this statement,i`ve seen nothing official regarding the cause of the explosion...
given the track record of these rigs and the track record of some environmental wackjobs,it`s not responsible if those questions aren`t addressed...particularly in light of obama sending swat teams to other rigs in the area...
The BOP did not close for some reason. That is the "failed piece of equipment" you mention. I do know that the Emergency Disconnect button was pressed. That should have closed the BOP and sealed the well but it didn't for some reason. There are several speculative reasons why it may not have performed as intended.
What is not responsible is putting blame on something until it is proven. All this media garbage blaming equipment/companies/people is completely irresponsible.
I have to laugh at the "SWAT teams". What an idiot.