For example, they KNEW that the BOP (blowout preventer) was not functioning correctly. one of the 2 control systems was out, and they had been bringing up pieces of the rubber seal in the test fluid. They were cutting corners on their cut corners.
You'd think this would serve as exhibit A to silence all the "GOVERNMENT R BAD, CORPORATIONS R GOOD" nutcases in the USA today, but unfortunately it does not seem to have had that effect.