Saddam was a very bad man, did some terrible things akin to genocide... but even he was preferable to ISIS (and the death toll of Iraqi's has increased massively since his demise) - he had only a matter of years left, we should have left Iraq alone as we had been for the previous decades during his most major atrocities. He would have likely died by now, but instead the Iraqi's are now living in hell.
As for Gaddafi, he ruled with an iron fist, but he wasn't genocidal... oppressive perhaps, but he still is and will always be immensely popular in Libya (except with the Jihadists). One million Libyans rallied in his support in Tripoli weeks before he was captured and killed. Picture below:
Have you ever heard of the Nuremberg rallies?