No child has the choice to be born under good or bad circumstances, so I'm not really sure how that's Emet-Selch's fault either? Emet-Selch implanted the Lightwarden into Vauthry, but that didn't make him "evil." Vauthry could have been a tragic hero if he had used the powers Emet-Selch gave him responsibly. dooming the world through no fault of his own as he played into Emet-Selch's plans. That's not what happened, though.
How is Titania any more evil than your average fae in the game? They turn people into living plants and outright murder to fill their ranks. Titania wants to play with us the exact same way the normal fae want to "play with us." Titania was sealed for being "harmful" to the denizens of Il Mheg, not somehow more "evil". Vauthry wasn't even harmful by virtue of proximity. His control over the people of Eulmore came from feeding them sin eater carcasses, not being around them.
Considering various points can be very interesting for fanfiction, but I'll go for what's actually in the game when I'm arguing a point.
What they did in life was attempt to help people, and their actions in death reflect that urge, even if it's not actually helpful to living beings. They're still not going around torturing, enslaving, or turning people for the joy of it, because those actions need human impulse. Titania doesn't do that either. Only one Lightwarden does, and it's the human one.
So you would describe "breeding fodder" in that way? That's what I was taking issue with, since I--like Emet-Selch--didn't mention the word "love" in my response. We know it wasn't anything nefarious, because he wouldn't describe him being taken too soon if his son was just a pawn in his plans. Pawns abound after all. Loved ones don't. (There, I used it now.)
"May." No Calamity has ever brought the world past the brink of recovery, even if it takes thousands of years. There's no reason given to expect why this would be different, even the part you quoted admits that.