@T_Starrk His current plan is great, he is effectively killing anyone who may ever try to get payback, he is ending the cycle of revenge by ending the world, but such a extreme decision was entirely his idea.
Pre-hobo Eren is just as selfish and as fucked up as the current resolute one that is flattening the world because he didn't like it, matter of fact, i think he was more fucked up back then.
He reached maximum fucked up at that moment, because that was the moment were despite knowing and admitting that what he was gonna do was wrong, he still decided to go with it, after that? well after that doesn't matters because he has a bunch of excuses to back up his actions, but before it, before it is maximum asshole, because he still plans to do it, has no real argument for it, knows that he shouldn't do it, but is still planning to do it.
My point is that the logic doesn't withstands, If i had called Miv worse insults (lets say i had used racial slurs, and hate speech) i would have gotten my comment moderated, because you can always choose not to do it, apologizing before hand in this scenario s not an expression of regret, guilt, or even a proper apology, all it does is show that while you were planning to fuck up and that you already knew that you should not do it, but that you are a big enough asshole to do it anyways, hell i could get my comment moderated right now, even if i was being facetious and doing it for the sake of making a point, and i didn't really mean it, at the end of the day i still insulted someone.
There are moments where an apology can be valid upfront, they are if you are being forced to do something against your will, and if you know that something accidental may happen that you can't account for and there's nothing realistic to avoid it other than luck keeping things safe. But neither of these 2 scenarios apply.
Hell Eren has sold himself the lie that this was an unavoidable fate is part of the things behind his resolution.
But.. if he really was feeling guilt back then, if he really was feeling bad about it, if he reaaaally was conflicted about all this, then and only then, it would mean that Eren is delusional and has been delusional for quite a while now, and has been lying to himself just to escape from his actions and the world, and that the currents events are just the product someone fleeing from reality in a tantrum, and he doesn't really has any resolution to do any of this and is just doing it out of cowardice and a feeling of inadequacy from facing the future (and such a thing would mean that some good ol Talk no Jutsu could probably stop Eren).