Every God-approved war of Jewish self-defense following the founding of Israel in the Old Testament, no?
For that matter, if you kill Fagin the Thief when he's breaking into your house (Exodus 22:2), does that mean that you incure a Biblically-reciprocal obligation to adopt poor Oliver Twist? (We'll leave out consideration of Voluntary Charity, which is always nice and good; I'm talking about a theonomically-required moral obligation).
I agree with you. There is no obligation to rebuild someone who was busy trying to murder your people.
David did expand the influence of Israel just about from River to River, but he certainly didn't rebuild the conquered areas. The custom I think was the reverse.
They paid tribute to him.
What a strange world ours is compared to his.
There's probably a lot of truth in "The Mouse that Roared"