Linden appears to believe, in the end, that she is responsible for/is the "official" cause of/w/e the deaths of many people. That is, the Worm is seen as an insentient being with her awakening it, therefore, the agential cause of the subsequent deaths. Now if this is true, it is not enough that "the world was saved anyway" for her to be justified in the end. Perhaps in new Arch-Earth her purpose in life will be to atone for recklessly killing tens of millions of people. But she does not seem entirely adrift in worry over the topic and Infelice dismisses the concern as a major possibility by referring to the mysteries of prophetic wisdom.
So, then, though, what of Infelice's argument? On the face of it, it is no more reasonable than saying that Covenant's guilt in the causing of the Sunbane is dispelled by the fact that the world could not have been saved in the way that it was (at the end of the 2nd Chronicles) had not the Sunbane existed.
Well, actually, this points to a subtle issue in technical deontic logic, namely that the following argument form seems wrong but is "technically" valid:
- 1. If I hurt someone, I ought to hurt them lightly.
2. I hurt someone.
3. Therefore, I ought to hurt someone lightly.
However, a different thing can be said about all this. It was not that Linden was justified in waking the Worm to prevent some other apocalypse that could not have been circumvented. Presumably, however the apocalypse came to the Land, a way should have been found to avert it--that's the pure logic of pure hope at play so often in the story.
However, Linden had to be able to help rebuild the Arch. Had she not been the one who agentially-speaking had destroyed it, perhaps she would not have been able to rebuild it. Then everyone would have died, including those who were saved. Now this is true even given Infelice's argument and is, directly or not, part of or an analog of it. However, I would add that what justifies Linden is not that she actually helped cause the salvation of the world by her action. Let us say that she did not in fact do so at all, really. She is only justified later by the fact that she helped rebuild the Arch. This does counter her past guilt, not by saying that it served as a means to an end, but by placing it in the context of her final redemption.