Pol Pot has a curious distinction on that list. For better or worse (hint: worse), the other three leaders on that list strengthened and united their countries, all three of which were in chaotic states of distress before their leaders arrived, and made them a force to be reckoned with on the international stage. Pol Pot, on the other hand, destroyed his own country to the point where even VIETNAM said "enough is enough." Pol Pot stands with Enver Hoxha and a few others as leaders who (intentionally?) sabotaged their own countries and ran them into the ground.
I agree. To commit war crimes and genocide against internal enemies or other nations can be explained by a desire to promote the welfare of your own people. Indefensible, inhuman and sick behavior but understadable if you adopt their ultranationalistic point of view.
But to commit these atrocities against your own people, that's the most deranged and absolutely evil thing imaginable.
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