Why Doesn't the ICC Indict Duvalier?

Gee, it sure does make the International Criminal Court at The Hague look like a political instrument of the Western powers when it never indicts vicious killer kleptocrat dictators like Jean-Claude Duvalier, for example. Sure, Slobodan Milosevic, Bastard Bashir of Sudan, and assorted African monsters deserve to be tried. (And executed, which the ICC isn't empowered to do. Those wimpy Europeans can't bring themselves to kill a mass murderer.) They forgot Idi Amin too- 'cause their buddies the Saudis are shielding him.
Oh, I just remembered: France, the country that has ruined Haiti for two centuries, sheltered Duvalier for the last 25 years.