about the ichor thing. it's effectively poison, i just thought it was important to mention what it really is and what it could mean in the context of the lore.
but no, i don't think hermes could have done anything. remember that gods are sometimes influenced by recursion, like when he arrives at the hotel in the main route about to repeat the myth of when he killed argos to rescue io. that's not just him going senile, it's a magical hypnotic state. plus, yes, he went agains t the servants of the other gods, that's the point. he totally would go against athena if he could and wasn't magically bound by the rules of the realm, and the trial that sentenced asterion, with the intention of sentencing many others of poseidon's children. they managed to stop the whole thing with only asterion having to be punished for it. we don't have the last votes yet to know the full story, so there's still a bit of intel we do not yet have about what really happened.
as for the argos thing, it really wasn't the cause of the modern acts of violence against asterion because there weren't modern acts of violence against him. he was a slave and a servant but he wasn't punished by the masters anymore. the little disaster with clement was the only thing, probably caused by athena through some trickery. the only thing bad to happen to asterion in modern times was being locked up in that room we found him for 80 years, feeling miserable for what happened to all the guests of the hotel. remember that we can't ignore the core rules of the labyrinth. what hermes managed to do there was to mitigate damage, but the roles that the labyrinth forces to happen still have to be enacted. even now, as kindly as mc treats asterion, he still is a slave and a servant, not from anything that mc does to him, just from the magic of the realm.