I doubt they can from a legal standpoint. The legal battle between BP and Transocean over liablility from the accident will probably go on for years, so don't expect any "I'm sorries" coming when that could be used against them.
Oh nooooo doubt at all. "Keep your yap shut...even if there's a video of you, with a shirt bearing your first and last name and neon blinking hat displaying the same thing in plain and perfect focus of the vid...Keep your yap shut."
Responsibility...what a kicka.