Regarding the mission to destroy the Eye of Helios:
An important bit of context, because I feel like the only discussion is that Moxxi and the vault hunters betrayed Jack.
Here’s the thing: they had every right to want him dead. It wasn’t arbitrary betrayal. Jack was a threat long before he became CEO.
This is a map of New Haven; the largest allied city in Borderlands and the vault hunters’ home between opening the first vault and the retreat to Sanctuary:
And this is Fyrestone; the first civilized settlement the vault hunters reached on their journey to the original vault.
Note in each instance the town proper, in green, and the bandit encampments, in red.
Jack’s plan, even assuming the purestintentions, is to use the Eye of Helios to annihilate bandit camps on Pandora.
The same weapon Zarpedon is using to destroy the moon.
He fully intends to use a weapon of mass destruction, powerful enough to reduce Elpis to rubble, to eradicate bandits on Pandora.
Consider those maps again.
New Haven is separated from two bandit settlements by a road.
Fyrestone is separated from the nearest bandit colony by a wall.
Throughout the rest of the Borderlands locations, bandit colonies spring up around integral structures and settlements, including trading posts, mines, power plants, sea ports, and sewage-treatment structures.
And Jack intends to raze them all using a weapon powerful enough to destroy a moon.
But he said it could be done with zero friendly casualties…
‘Friendly’ being Hyperion armed forces. Not vault hunters. Not civilians.
Jack is not allied with anyone on Pandora.
He has, at this point, already used Angel to manipulate the original vault hunters into opening the Destroyer’s vault, with zero regard for their wellbeing. He has already built a weapon of mass destruction. He has already used an eridian artefact to amplify that weapon’s power.
And a woman once in Oregon came up to me at a bookstore and said, you know, in one of your books, you teach that it is sometimes necessary to lie. And that seems like a very disturbing lesson to me. Can you name one time when it would be absolutely necessary to lie? And I was so happy that the answer came to me right away, instead of, you know, as it usually does when people say something to you. … And I was able just to turn to her and say, nice sweater.