Snape, A Murderer? Thoughts about the unforgivable curses ...

[vmonte]

No: HPFGUIDX 95382

Sigune wrote:
No-one responded to my "DE-competence-question", so here I launch it
again: if Karkaroff can't steer the ship, maybe also he isn't
powerful enough to cast Unforgivables. And if he didn't use
Unforgivables, that might explain the Wizengamut's relative leniency.

vmonte responds:
I think you may be right that certain wizards cannot cast 
unforgivable curses, But I think it's because they do not have enough
hatred/depravity inside of them. (I'm not saying that Karkaroff is a 
good person by the way.)

I'm begining to think that it takes a certain personality to 
successfully do these types of curses. I also feel that these curses 
not only do damage to the recipient of the curse, but to those who 
continually use it. To make a bad analogy, I think that doing 
unforgivable curses becomes addictive, like drugs. The more you do it 
the more you cannot stop from doing it.  Unfortunately, like drugs -- 
it can kill you!  

Perhaps, DD doesn't want Snape to teach DADA for Snape's own safety. 
(You wouldn't want to hire an alcoholic as a bar tender would you?) 

Snape on the other hand wants to teach DADA because he craves it. 
(Or perhaps, he feels that he has overcome his addiction.)
 
Is it possible that some of the DE's could be unwilling members of 
Voldemort? Is it possible that Snape did kill people but that he was 
somehow controlled by Voldemort? If so, then I can understand why DD 
would be able to forgive him. Did DD save Snape by freeing him from 
Voldemort's grasp?