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I read the blog comments and 90% of it was way over my head. However, from what was posted, it sounds like general sloppiness on the part of BP. Lots of amazement expressed about the actions taken ("they did THAT? You NEVER do that!") by people who - to me at least - sound like they're in the know.

I suspect that you don't make small mistakes at that level of engineering.

Sabotage is certainly a possibility, but the simple explanation is corner cutting and laziness. The giveaway was a comment about crews changing over at roughly the same time as the accident. People in a hurry to get off the rig, etc etc.