The story of Jonah is propelled forward, we learn, because Calamity looms over Nineveh. We don’t know what kind of calamity it would look like, all we know is that there is pending consequences for the Assyrian empire.
And Jonah is told by God to walk headlong into this situation, “to go and proclaim to, rather than against, the city” about what is about to happen.
This is significant. It is also significant, I think, that the first and only time a biblical prophet is asked by God to go into a non-Jewish city and give it a message from the Lord.
Do you see how dicey this situation is?