sure they are, just like the ceo's of a company is responsible in the end. Even if the CEO didn't know ... it's his head that rolls

There may be fault all around, all the players had a part in it, but its the responsibility of bp to make sure all operations are up to snuff.

but this was an accident and blame doesnt clean anything up. only money will clean some of it up...

Let bp sue halliburton and transocean and the oil after its cleaned up to recoup any costs they want...