You'd think that and yet there is a fairly decent list of people who have survived a shotgun blast in the torso and even head at that range and survived. In pretty much every one of those stories, the shotgun was loaded with birdshot.
I appreciate the info, but NONE of those stories prove your point. Many of them are lacking important details like range or the angle of the shot. 2 were with a .410. One appears to have been close range, but was a shot to the jaw so I can only assume it was from a side angle (the shot destroyed her jaw and the murderer killed at least 2 other people with one shot each in the same house).
I actually know 3 people personally who have survived 12ga birdshot, but that proves nothing because they were all at much much greater distances than a home defense situation.