In Tennessee a 12 year old girl was watching a police presentation about drinking and driving when one of the gruesome photos they showed was of the remains of her father. Needless to say, she was traumatized.
Among the reasons we don't usually show photos of the dead is that such a gruesome photo can drive all other pleasant, happy, loving mental images of the deceased out of one's mind.
Showing respect for the dead is one of the hallmarks of every culture on earth.
Rest in peace all those who suffered such an undignified death.