Karmic justice in Potterverse again. WA blood bond between Snape and Dumbledore?

[pippin_999]

No: HPFGUIDX 144939

Alla:
> What I DO think that it is possible that what James and Co did to 
> Snape was  retribution, not just bullying. Does it make it less 
> ugly? Sure it does  NOT, but is it SO hard to imagine that Snape 
> used the curses he himself invented on Marauders MANY times which we 
> have not seen yet and now got what he dished out?

Pippin:
Er, yes, it is, because nobody ever says, "Snape started it" or
"Snape's gang of Slytherins started it."

We know that Sirius has a yet-to-be-revealed reason for loathing 
Snape...but JKR says it was mutual. And why's everybody so delicate 
about saying what it was? 

Could it be it doesn't make either one of them look very good?

Alla:
 We KNOW that he killed Dumbledore.

Pippin:
We know nothing of the sort. Harry is not competent to determine
the cause of death, Chosen One or not. He's not even a fully
qualified wizard.  Just because everybody believes Harry doesn't
make him right. 

Pippin