The following propositions are not mutually exclusive:
1) Saddam Hussein was a horrible tyrant who murdered hundreds of thousands, directly and indirectly, through war, famine, torture, etc.
2) The Iraq war to remove him was a mistake.
also, stemming from point 2, as has been said above, Neither Qaddafi, Mubarak, or Bashir were able to keep their countries from sliding into civil war during the Arab Spring. None of those countries are better off now, regardless of whether or not we invaded or supported a particular side. Sometimes, the US is an outside player, and the best we can do is watch and not get bogged down in a civil war. ISIS happened for many reasons, the US being a very small one of them.
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Best explanation that destroys any attempt by Trump cultists to twist themselves into pretzels to defend the guy on this