oh boy...this claims that GOD will do the destroying. If you don't like Isaiah's prophecy, that's fine. Maybe you can complain to God about his genocide.
15 to 17 are about what GOD will do (מאת ה׳ מן השמים). Verse 18 is, according to some, a literal propehcy of an end times war between Gog and Magog, and according to others, a
metaphor about the destruction of the attributes of the house of Eisav. Another explanation is that the metaphor expresses how the war will go -- because one side will act like fire and the other will be weak, like straw ("ובית עשו יהיו חלשים כקש"). One commentator understands it to mean that, like straw, one will ignite the other (so the fire only has to set one piece of straw on fire and the fire will be transmitted internally). Feel free to
explore the options.
so you are angry that God says how things will be. Your anger should be towards God, unless you deny his word. Remember, this is what they want to do. They realize that enslaving Jews was wrong so now they will help raise the children. None of this is done by the Jews. This is all done after the realization of God.
So here are more examples of why you must either be angry at God, or you reject the content of the Tanach. If it is the former, write him a letter about how he is unfair and mean. If the latter, then there is littleto discuss. You have your texts, and I have the Torah.