Evil does live off the island so what is Jacob talking about?

What could be more evil than the world without MIB? I ask because it hit me, Jacob says MIB is an evil that he must keep "corked" up on the island and not let it escape and infect the rest of the world. We have seen the world with Riccardo and looked to have a lot of evil going on in my opinion. And what about the world the Losties live in, both OT and FST? Lots of discussion on these blogs about how their lives either way have not been pure joy. So whether Jacob is the true evil one or it's MIB, I ask, what good is keeping the evil on the island when it still exists off island?????

Also on Fandom

Random Wiki