[During the 20th century] ... ...

[During the 20th century] ... 170 million men, women, and children have been shot, beaten, tortured, knifed, burned, starved, frozen, crushed, or worked to death; buried alive, drowned, hung, bombed, or killed in any other of the myriad ways governments have inflicted death on unarmed, helpless citizens and foreigners.
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 Rudolph Rummel

Quotes from the same author

Our knowledge and our ability to handle our problems progress through the open conflict of ideas, through the tests of phenomenological adequacy, inner consistency, and practical-moral consequences. Reason may err, but it can be moral. If we must err, let it be on the side of our creativity, our freedom, our betterment.
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 Rudolph Rummel
Power kills, absolute power kills absolutely.
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 Rudolph Rummel
The way to virtually eliminate genocide and mass murder appears to be through restricting and checking power. This means to foster democratic freedom.
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 Rudolph Rummel