ast486: Since you obviously didn't ready everything in game about it, read this:
http://numenera.gamepedia.com/The_Sorrow Well, for starters, your own link doesn't support you. It says the Sorrow MAY have destroyed the civilization, and even if it did, it's probably because the entire civilization was based on Tidal Abuse, and so saving any of them was impossible.
That is also blatantly told to you in game several times.
Actually, people claim it's what happened, even though they didn't see it and have no proof. And most of the people claiming the Sorrow are evil... are the people abusing the Tides. Which the game shows almost certainly is a very, very bad thing.
The sorrow is a destroyer; it doesn't give a rats ass about casualties; it starts off every battle by unleashing a mindless hoard of lesser killing machines which spread magic fire!
That's not something that's careful and precise about killing!
Except the Sorrow never attacks mortals that aren't protecting Castoffs, and thus TIdal abuse. Ever. It doesn't kill any bystanders, in the game, ever. It IS very precise and careful.
You argue that the endless wars is continually expanding so the sorrow is justified in killing castoffs.
While the endless war is stupid and the leader of at least the First's side has lost all worth as a human being, I must call bullshit!
One person doing something violent, doesn't justify another person/creature doing the same.
It's not 'one person,' it's the vast majority of castoffs. Both sides of the Endless Battle are being run by dozens, if not hundreds, of castoffs. And that's just who's currently doing it - Many of the castoffs you see outside of the battle are just on break and are heading back there eventually.
" The Sorrow isn't some mass murderer shanking babies in the cradle out of spite "
You are correct that it is not out of spite, however, It is a massively powerful murder machine that cares not at all for collateral damage.
Except that's not true. The Sorrow spends most fo the game carefully tiptoeing around, limiting it's colateral damage, and while it wont directly oppose you if you choose some of the dick endings, it quite obviously wants you to choose the route that destroys the castoffs and leaves the world alone.
The sorrow doesn't CARE about all the people you, your siblings or it has killed; it's just a creature designed to kill... period.
No, it's a program designed to stop Tidal Abuse. Unfortinately, because of how the Castoffs are built, the only possible solution is to kill them all.
It destroyed entire WORLDS of people; it is not possible that every man, woman and child in those worlds was abusing the tides.
At no point in the game is it concretely proved the Sorrow killed people without reason, and it has certainly not destroyed entire worlds, as in a planet - It's destroyed entire civilizations, of which every single person involved was reliant on Tidal Abuse, but like our current civilization relies on fossil fuels.
EDIT: And of course, it destroying those civilizations is still hearsay. It's still quite possible that those civilizations destroyed themselves and the Sorrow just cleaned up, like how the Castoffs are in the process of putting the Ninth world to the torch and the Sorrow's showed up to get rid of them.