The thing is: The military operation in Iraq was a total success. ISIS didn't come into play until Obama decided to surrender the gains of Bush.
Now, I agree that we should not have toppled Hussein. But there was still a net gain in Iraq until the withdrawal. The problem was that a long term commitment was required to maintain the gains...at least for the next 10-20 years, maybe even more. Obama was not willing to allow such a long term commitment, so he sacrificed the gains of the 3500 combat deaths, and he withdrew (remember: ISIS was just the JV team...no concern at all).
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