Why is AK unforgiveable

[sgarfio]

No: HPFGUIDX 45137

Ooh ooh, I just had an idea.  This ties into with the recent posts 
that have speculated that AK is Unforgiveable because the victim's 
soul is captured, therefore depriving the victim of any kind of 
afterlife, such as ghosthood.  If Voldemort AK'ed Baby Harry and the 
curse rebounded on him, where would Voldemort's soul go?  Into his
own wand?  Into Harry?  Nowhere?  Of course we don't know the 
mechanism by which the soul is transferred, but here's what I'm 
thinking:  Normally, the curse would go out of the wand to the
victim, grab the victim's soul, and bring it back into the wand.  But 
what if the curse bounces off of the victim, as it did with Baby 
Harry?  Now the curse goes from Voldemort's wand to Harry, bounces 
back to Voldemort *empty-handed*, so to speak, and grabs Voldemort's 
soul.  Now it's as if the victim has initiated the curse, like light
bouncing off a mirror.  Since Baby Harry had no wand, there would be 
no place for Voldemort's soul to go.  It wouldn't be captured, but 
neither would it still be housed in his body, and his body would die.  
This is not a normal state for a soul; it must be housed in something, 
which is why Voldemort had to inhabit other bodies to survive.  Having 
to house two souls is not what bodies are built for, so they burn out 
after a short time.

My apologies if this just reiterates something somebody else has 
already said; I'm still quite new here, but this was something of an 
"aha!" for me. :-)

Sherry