It's rather callous of you to call the Liberator's revolt as "bunch of stupid naive ideals". For one, you'll be branded a heretic for joining the Liberators to begin with. Also, their main reason for revolting was to enable the denizens of Tortus to carve their own path, and as much as they wanted to kill Ehit right there and now, if the people they fought for died then the whole rebellion would've been pointless. And lastly, on all occasions the Liberators charged recklessly, it was all due to Ehit's machinations that no one could prepare for.

As for that second Ehit, they had already created one. Two, actually. People with power will use their powers however they wish, and the Liberators had no right to force their dreams on future inheritors of Ancient Magic. They also had went through great lengths to ensure that only the strongest could clear their Labyrinths, and they really hammers in the Liberator's lessons with the Melusine and Haltina's Labyrinth, and Ehit would've definitely provoke them like they did to the Liberators and Hajime's party.

And yes, Ehit is way stronger than the Liberators. He is also stronger than Hajime. All that power doesn't stop him from getting outwitted by Hajime and his arrogance ultimately become his undoing.