I blame them all
Yes Dan is at fault but really, they are Dan's friends. They know his douche bag personality. They should know he's forgetful. You go out on a yacht with this guy and don't even think about how you'll get up on the boat yourself. Yet they jump in the water anyway. Yes, Dan should know how to get on the boat but why rely on him alone? They were all responsible for making sure the ladder was down because jumping in the ocean is not like walking across the street.
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