Why do they care about that big secret in ob

Why do people care that humans came to roshar? Everyone Acts like it a big game changer. No one said "its our land now", or even question if the translation is right.

People have lived on land for just a few generions and have fought and died for it truly believing it's theirs. Why is no acting like this one part doesn't matter?

I get being concerned about surge binding destroying the world.