Every killing tears the soul?

[finwitch]

No: HPFGUIDX 141497

> 
> Elyse:
> I have asked this question before as well. This is precisely my 
> contention with the whole Killing-tears-the-soul so called "canon".
> Slughorn told Riddle that in order to create a horcrux, you have to 
> murder someone. This was so that you could use the death of another 
> person to harness your soul piece to the object.Nowhere is it said 
> that *every* killing rips the soul.

Finwitch:

In addition, I remember Albus Dumbledore telling Harry that to create
a Horcrux, it takes unjustified killing for the soul to be ripped
apart. Killing in self-defence or in defence of another is justified.
Killing an innocent is not, so anyone slaying unicorn is cursed and
Centaurs never attack foals...

It's not every killing, of course - it's only the unjustified killings
 that tear the soul. Of course, one must be very careful as to say
what sort of killing is justified...

Finwitch