I never suggested that it wasn't grace. Neither did I suggest they didn't repent. I am suggesting that God took the initiative and sent a preacher. And that He did that so they would repent.
There were many more nations that He did not do so for.
When God moves, it is always with a purpose.
And God had every intention of destroying Nineveh as he said he would do. God changed his mind. That's scripture. Align with scripture or follow a RCC heretic.