Henry Kissenger, for one, was a straight-up war criminal. “Worst persons who have lived” doesn’t have a very precise definition though, so I’ll pass on judging that one.
Perhaps not in the "worst person that have lived" category; but many have said Obama was awarded the prize almost entirely on the merit of campaign promises he has since failed to enact.
All of the leaders of countries involved in any kind of war during their ruling would certainly meet the criteria. If Yaser Arafat and Barack Obama deserved the Nobel Peace Prize, I guess now it's time for Vladimir Putin to make the list complete?
Really? That's all the criteria for "worst persons to have ever lived"? That's a pretty low bar and seems like it would qualify pretty much every head of state ever.