How can you be so sure the dead can not kill the living. That would mean that spirits are impossible. How can you prove that to be so?
Well, I can't prove it. But I still consider it impossible. (As SNG mentioned, I only say they can't kill. Not that they don't exist. [I consider that possibility to be highly unlikely, but not impossible])
If spirits could kill -- I reason -- they would. Dead children would come back and kill their heartless parents. Murder victims would seek revenge. "Bad spirits" would kill for kicks. Yet we don't see any appreciable number of unexplainable deaths. A person could argue that people die in supposed "accidents" that may actually have a spirit behind them. But I personally don't buy that at all.
You can see something of my character in the fact that I'm willing to call this totally impossible, while others with similar beliefs (SNG, for instance) would only label this "highly unlikely". I don't know exactly what it says about me, but it says something. (I suspect it's something bad.)
Dave