No matter who we bomb, we create more enemies so it makes no sense to bomb anyone. We don’t know what we are doing there so stay home and watch.
There are objectives that are desirable and obtainable.
The current objective is to draw boundaries between ISIL and the Kurds in the north of Iraq and the Shia in the south. The bombing has been worth while in that very limited objective.
Iraq is partitioned. There is no more Iraq in the old sense.
Ditto Syria but the boundaries are more tenuous. I expect ISIL will turn on Aleppo again when the status in former Iraq becomes more stable.