I would imagine that in this circumstance, several adults were sitting on the cabintop making the vessel extremely top-heavy, especially since the ballast tanks were empty. Since it was a borrowed boat, the person in charge (I hesitate to say captain) probably didn''t know the handling characteristics of the vessel. I am amazed that many people think that because they can drive a car, they can handle a boat. It is likely that a wake from a larger boat upset the Mac and contributed to the accident. Of course, this is all conjecture. As stated before, its not the design of the Mac that caused the tragedy, it the ineptitude of the captain and crew that caused the tragedy and the captain should be held accountable.