This isn't about who you were replying to specifically, it was about the general argument used in the thread. You stated earlier that Ella's death was not Hawke's fault because Anders' did the deed, despite Hawke's potential to intervene (which makes sense, given the requirement for metagaming). My point was that you can't use different logic for Isabela returning the tome, which also requires player action.
You may have been responding to the Chantry-explosion (which obviously happens regardless), but my basic point is that you cannot generally exonerate some characters and not others for actions that are entirely player-dependent.
Isabella Stole something but the Qunari are masters of their own actions. Isabella doesn't cause the Qunari to act as they do. Anders doesn't steal a book which cause other people to kill Ella in search of a book.
I think there is a vast differenace between isabela's actions and Anders actions. And isabela either helps or doesn't help based on her own motivations. Does she like you enough to try and resolve the issue? This shows that in the writing her character can grow, Anders doesn't grow as a character he devolves. Even with high friendship/romance all you can do give Anders comfort as he devolves which is required for the plot.
So while I take actions that have ripple effects on the world because of the mechanics of the game that still doesn't mean storywise all the actions anders takes make him inculpable. This allows me with consistancy to agree with the poster who says "At least Isabela.." because storywise Isabela did try to mediate a crisis. Anders idea of trying to resolve a crisis of his actions is to Blame it on the templars.
Just because events unfold based on a series of choices you made doesn't mean the characters doing said actions/events are not responsible for their actions storywise. For example...
Lets say In Inquisiton (Talking hypotheticals here not actual real game events) i have a choice to help save a carravan from bandits or a village and i pick the village because of X. The reason is not important. And lets say a young mage surivives and hears i saved a village over the carravan and he decides to Kill a camp of Inquisition soldiers in vengence. Yes mechanically I caused the camp to be destroyed because of the choice I made BUT storywise it is perfectly acceptable for me to blame the mage because the mage made the choice. If you don't view the events in the game from a story perspective than most of the game loses impact because everything that happens is your fault so you are better off turning the game off that way nothing bad happens because you set the mechanics in motion. I much rather view a story based RPG on the actions the characters make then view them through the lens of well me the player did x which means y character did Z. So i caused Z.