Okay..... so like.....
A: this child will bring chaos to the world, but if we kill him the village will be cursed
Villager: alright let's imprison the child to make sure the world is at peace!
Let's take out the reincarnation memory out and....... 18 years later
Demon A: kid.... u've been living in this shit hole ur whole life right? Shall i tell u something good (evil grin)
Kid: what........ but why? What did i do wrong? Why did they do this to me? Why? Why? Why? Why? Why?!!!!!!!!!
Kid awakened his hidden power and proceed to destroy the village and soon, bring chaos to the world....... the villager had did what needs to be done in order to fullfil their own prophecy......