Methinks this century will be even bloodier than the last.Hmmmmmmmm....IMHO...that might be a too close to call.
The muslims and their aggressions in the Horn of African, the Balkans, the Middle-East, Southern Asia, Southeast Asia, Phillipines.
VERSUS
The Stalin/MAO/Castro communists of Soviet Union, China,Vietnam/Cambodia, Cuba/Angola, etc. And of course Hitler...but his evil/chaos were small compared to the 85 year legacy of communism.