[HPforGrownups] not giving Snape credit?

[Bart Lidofsky]

No: HPFGUIDX 169204

Sherry:
>who cannot accept any spin on that event.  I don't believe in murdering your
>general, leader and mentor, the only one who wholeheartedly believed in and
>supported you.  I've not yet heard *any* explanation for it that makes it
>work for me.  I don't believe in murder for the so-called greater good.
>Once JKR said DD is definitely dead, she took away any lingering doubt for
>me.

Bart: 
Have you considered this one: Dumbledore should have died when he tried to break the curse on the ring. Only quick thinking and action managed to, temporarily, keep death at bay, but it could only slow down death. Between this and the potion he drank in the cavern, Dumbledore was going to be dead within an hour or so. Dumbledore had previously extracted a promise from Snape: "If I am going to die anyway, kill me, so at least my death will help cement your position and further the cause." Snape did not murder Dumbledore as much as he pulled the plug on a terminal patient for whom the life support system was on the verge of failing, at the patient's request. Also given this, he had no problem taking the Unbreakable Vow, because he knew that he was eventually going to be the one to "pull the plug" on Dumbledore. 

In this scenario, Snape had three choices: 
1) Kill Dumbledore (or remove the life support system he created, under the guise of an AK spell). 
2) Let someone else kill Dumbledore, killing Snape in the process (for failing to fulfill the unbreakable vow). 
3) Break his cover, probably die in a battle with the Death Eaters, and Dumbledore dies anyway.

Note that in all 3 scenarios, Dumbledore dies. Do you really find it unforgivable for Snape (on Dumbledore's request) took the path which would best help achieve DD's goals?

Bart