Is God advocating rape, pillage, and plunder?

Isaiah 13:15-16(NKJV)

    Everyone who is found will be thrust through,     And everyone who is captured will fall by the sword.

    Their children also will be dashed to pieces before their eyes;     Their houses will be plundered     And their wives ravished.

Wow, this is what God says will happen to Babylon as punishment for taking Judah captive.  Kids will be killed and wives will be raped, and houses will be plundered. 

Now is God advocating it or just allowing it to happen?