History teaches many lessons … if we are paying attention.
The children of Esau treated the children of Jacob despicably. Their traitorous disloyalty to their brothers would come back to haunt them; this is the burden of Obadiah’s prophecy. But the judgment of Edom would also serve as a cautionary tale for other nations that had either mistreated Israel or would go on to do so. God made an example of Edom to teach others not to do what they had done.
It’s not as if Edom had not been put on notice. God promised Abraham, “I will bless those who bless you, and him who dishonors you I will curse.” When Jacob obtained the birthright and the blessing from Esau, this promise and protection became his. Esau knew it, but apparently his distant descendants had forgotten it.
That’s one of those lessons it’s unwise to forget.