To add to my prior comment, it seems like expending military resources to retake this area is a waste, since the citizens there support ISIS. Instead of getting soldiers killed fighting to "liberate" people who probably don't want to be liberated, maybe they should have just dropped a bunch of leaflets on Mosul, explaining that the dam isn't being maintained under ISIS control, and without maintenance will fail in a…
And these people back in 2003 were asking for the USA-led coalition to invade their own country, topple the government, wreck the country's infrastructure, and leave a power-vacuum in its place? A vacuum filled in by local warlords and ethnic-cleansing militias?
I dispute the idea that we in the West have no responsibility here to help.