When a guitar falls it has the tension of the strings (well over 150 lbs of tension depending on strings, and on a 12 string its even more) connected to the body pulling one way, and the neck is at a 17 degree angle, and when it falls to the floor something usually has to give. Many times it creates the classic SMILE break we see in the first post. Obviously the weakest part is the wood where it snapped. Is it the design? Its been discussed there many many many and lets give it one more many, times.
Its not just LP's or SG's. Almost every Gibson has the 17 degree headstock angle. Not sure about Firebirds or Explorers or some of the weird ones they have done in the past.