I think the 'justification' would be that if they didn't want to go to or stay on the island, it would be a HUGE pain in the ass to raft them back to the mainland (especially if EVERYONE wanted to go back).
@robot1840 : He didn't know if they're willing to go with him to the island, and also he figured when fighting the mage that he can use this chance to add knowledge of 'human as enemy' to his villagers.
I mean.... Yeah, he could have at least gave them the option of moving to the island BEFORE the big fight. He coulda explained it beforehand and avoided the whole thing... But i guess action is needed in the manga -_-
Abyss pretty much won the fight - was there a reason for him to be showcasing his "top secret" hidden space to other people regardless of their ability to access said space?
yes just leave the psycho slaver mage, he's totally innocent and deserves to be spared, all he did was enslave innocents and try to murder you all.
@Halo "i know your family was slaughtered, your kingdom destroyed and you were enslaved but just forget all that and never have any thoughts of vengeance, just be a farmer instead" god this MC is a pussy, for someone who was literally kidnapped and sacrificed by fanatics you would think him of all people would understand wanting revenge but no he's mentally castrated himself instead.
@CalamityCallout and @SilverSeagleLive He's been looking for a way to introduce danger to the village, so that they would advance their technology, learn to work with metal, or start making weapons. He's been thinking about this since the first village expansion, I think.
@robot1840 He explained right there, once the guy was tied up, and everyone was free to go. He doesn't want to force anyone to go to his island, he waited until everything was cleared up, to ask if they wanted to go.
Also i call bullshit on the new Mage slave, her princess just explained that they were a country of farmers, you expect me to believe she doesn't know that he would need to plow her field, for it to be an established fact?
I hate the mc thinking that revenge is bad, he should at least allow them to take their right back. I believe in the 'eye for an eye, and life for a life' justice.