This isn't about accusing Hermes of anything (yet), nor about where the convenient memory wipe machine comes from or who made it, it's about finding out what the hell happened to one of the most important dudes in the world because it involves something that is apparently 1. not known to Elpis outsiders like Emet and 2. skirting the law.
I just... I don't know, does this convenient memory wipe machine not keep any log of its activities?? I suppose not, its legality looks to be dubious in the first place, might as well go all the way with dodgy design. Can't the memory wipe spell it casts be reverse engineered and undone like the Sharlayan Council does with its members? I suppose not, because...?? (handwaves)
Also, this doesn't really have to hinge on anyone's word either. We were able to conveniently use our Echo on that floating island to watch Hermes talk to Meteion on the waifu space probe launch day. Is this just a Sundered Azem thing? I suppose so, otherwise an Ancient with this ability could just have watched the post-Ktisis cutscene, and oops.
Honestly, the fact that whatever law it is about memory wiping even exists in the first place, the overall complex processes surrounding their creation magicks (evaluation, official approval and archiving, etc), and Themis making casual mention of mind control spells in Pandaemonium (and that he flat out asks Eric "you would rather capture Hesperos than take him out after what he did?" honestly my little guy I don't know what sort of things you've been witness to so far but eesh) make me believe that bad stuff has definitely happened in their history (or that, at least, they were absolutely not naive about potential disaster). After all, this is a world where anyone could potentially come up with a world-ending creation and simply not tell anyone or register it anywhere. Personally, the way I view Ancients is that every single of them could be a ticking time bomb, and yet they've apparently been living in peace for who knows how long, which is, frankly, a miracle.
I like this. I guess Hermes's greatest creation wasn't stratospheric birds after all, it was the Idiot Ball he materialized and passed everyone.
Since the 4.4 reveal, I've always seen the case of Garlemald from the Ascian PoV of "these people have long been persecuted for who they are, they're ripe for cultivating resentment and grooming them into a force to promote further chaos". Garleans just keep getting the short end of the stick tbh
Emet-Selch: "And I would never do something as stupid as allowing you into my lair!"
Narrator: "He did."