Well, we really don't know. But a series of specifically placed explosives in the caverns, assuming they're as extensive as we're being led to believe, is certainly an easier way to create a 1km crater with less explosives and less ejection of debris. It would also appear to the outside observer to more readily be ruled an accident. I'm sure the more experienced investigators wouldn't think so, but if there were a coverup, it'd be easy to say something like "unknown disturbance caused caverns to collapse" or something and write that off as an accident. Blame it on an earthquake, or gas, or volcanic activity, make up whatever story you like and declare the island off-limits due to "seismic instability."
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