I think you misunderstand my point, I never claimed ainz couldn't stop it, quite simply that they're actions in no way affected the plan. Ainz is a petty asshole but him not sparing them isn't a result of them upsetting him in the moment, it's a result of that literally being the plan. As I said nobody that entered that tomb was going to leave it, that was always the idea and nothing arche and her group did mattered after they set foot in the tomb. (The most they changed was arche getting a swift death which literally nobody else in the tomb got the mercy of) Reread my points I never claimed ainz couldn't stop it, or that this situation wasn't entirely the result of him being evil (TBf you can also put some blame demiurge being a dick, the plans a bit outside ainz capabilities/thought processes. But ainz has the authority to say no stop it and doesn't so the ultimate blame falls to him). Just that him getting upset over his friends quite simply did not matter in the scheme of things.