Sin can cause a monarchy to fall.

Just like king David's did all go downhill after the afternoon with Bathsheba. And everyone in Israel were discontent. They were grumbling about the behaviour of the royal children. They said, if these royal children are behaving like this, how can the monarchy survive?

I now understand why God hates sin, and bequests that His adopted royal children be sinless and perfect, just as His High Prince Jesus Christ is.