mahgister,
"...the absolute disappearance of anything, makes absolutely no sense at all..."It may not make sense in this current world we inhabit. Lavoisier and his thoughts. It also may seem scary at times. It does not mean it does not happen. Of course, you could say that decomposing into some carbon (here we go again), oxygen, potassium, and whatever else, means there is no absolute disappearance and you would be right. However, for any meaningful purpose, once a person dies, she/he is dead. Gone. Most of the time wheeled out. Sorry to break you that news.