I like good AU stories, and to me ignoring/changing something from old canon is writing an AU story. I have no problems with it, and I'll happily read it if I like the pairing/plot/etc.
I've written stories like that as well. My Of Wolf and Man series is an AU in which Sirius didn't die at the end of OotP. Instead Remus pulled him back from the veil. I think it works in those stories, and I've gotten a lot of positive responses for those fic.
On the other hand, I don't shy away from writing Sirius as dead since OotP, either. If the plot demands it, I go with it.
So for me there is a difference between someone writing a story that explores the idea of Snape not having killed Dumbledore (for whatever reason) in HBP, and someone in full denial of those events in HBP, unwilling to even consider them ever in a story. The first is playing with canon and creating what if scenarios. The latter is just plain denial. If that makes sense. :-)
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I've written stories like that as well. My Of Wolf and Man series is an AU in which Sirius didn't die at the end of OotP. Instead Remus pulled him back from the veil. I think it works in those stories, and I've gotten a lot of positive responses for those fic.
On the other hand, I don't shy away from writing Sirius as dead since OotP, either. If the plot demands it, I go with it.
So for me there is a difference between someone writing a story that explores the idea of Snape not having killed Dumbledore (for whatever reason) in HBP, and someone in full denial of those events in HBP, unwilling to even consider them ever in a story. The first is playing with canon and creating what if scenarios. The latter is just plain denial. If that makes sense. :-)