Snape: Evil or just doing his job?

[spinelli372003]

No: HPFGUIDX 133132

I have read and reread the ending of HBP.  I am also in the Snape is 
not bad camp.  He dislikes Harry.  No getting around that.  However 
several things in that last sequence struck me as odd.  If he was in 
fact evil as so many have pointed out he would have killed Harry when 
he had the chance. Or he would have allowed someone else to do it.  
Instead he put a stop to the spell that another had put on Harry 
Getting rid of the pain Harry was in.  Also as we all know doing an 
Unforgivable curse is cause for going to Askaban.  When Harry tries 
to do them Snape stops him and says "No unforgivible curses for you 
Potter" He is angry at Harry and says something to the effect 
that "You would try to use my own spells against me?  Telling Harry 
who his is when he could have at any time killed Harry.  So I am in 
the Snape is not evil camp.  

I do have another theory that may or may not have been raised.  The 
posts are flying to quickly to keep up lol.  But is there anyone else 
out there wondering if in fact it was not Dumbledoor but someone else 
who died?  Maybe someone using polyjuice potion?  Or maybe one of the 
Charms that Lily was so well known for making everyone think it was 
Dumbledoor?  
Sherry