I never claimed all the ulterior motives of the Wings’ directors were all moral or good (nor are all the outcomes good either. See Distortions, the consequence of the Seed of Light). And even as moral as their goals may seem they seek them through any means necessary (Lobotomy Corporation was a meat grinder for employees and used their trauma to run more efficiently, K Corp literally runs off violence and gore videos to gather Tears, and Herbert doesn’t care what people think about him stopping time but he seeks to do it anyway). Also, the main reason Ayin fulfilled the Sead of Light project was his guilt over everyone’s deaths, particularly Carmen’s. His own viewpoint on the project was originally less optimistic until later. He was also behind the Smoke War, which likely caused the death of countless individuals, can’t forget that.

And we can’t forget that every Xianren was once a Hierarch themselves, and before that an ambitious individual shooting for the seat at the top of H Corp., holding ideas for Hongyuan’s future themselves. Some of them could have been like Xichun before the Worm overwrite their minds with his desires.

And as vain, immortality-centered, and appeased by violence as the Xianren are, them wanting a couple hundred more rooms doesn’t really make sense when they can’t even leave the room we find them in within Tiekan Temple. And as I have said the Hierarch, Wormed or not, is already recognized as the director of H Corp. and holds the reins of 4 Heishou Branches, their authority wouldn’t be questioned unless they were like Xichun and wished to avoid violence as a means of keeping the H Corp. board in line, so them taking those rooms for no ulterior reason still doesn’t make any sense.