you are right, book 7 changed a lot of our perception of dumbledore. i had the feeling that a lot of "evil!manipulative" dumbledore fanfics were written in this time.
but i think that dumbledore was like a general. he was ready to give his life and expected his soldiers to do the same. and when it came to soldiers, snape was certainly his best soldier. and generals never hesitate to make sacrifices.
as long as he thought he could save snape he did, but i think in book seven - after losing so much to voldemort he was also desperate.
strangely what saddened me most was that in the epilogue - when all the sacrifices that snape had made were known - dumbledore didn't even mention him when he and harry were at king's cross.
but i think that dumbledore was like a general. he was ready to give his life and expected his soldiers to do the same. and when it came to soldiers, snape was certainly his best soldier. and generals never hesitate to make sacrifices.
as long as he thought he could save snape he did, but i think in book seven - after losing so much to voldemort he was also desperate.
strangely what saddened me most was that in the epilogue - when all the sacrifices that snape had made were known - dumbledore didn't even mention him when he and harry were at king's cross.