barros
Correctly predicted Portugal to win Euro 2016
They were horrible people but their actions can't be blamed on being athiest, it was mainly all about power or political ideologies in those examples. They may have all also been left handed but it wouldn't make it a sound point to say that left-handism has killed more people than right-handism. The difference with religion is that many conflicts and murders can reasonably be attributed directly to it as a root cause. I do agree also that in many other cases, it is in fact a power struggle rather than religion that is truly the cause.
Stalin - 34 - 49 million people killed
Mao - 49 - 78 million
More deaths than the first and second war together and yes the left handed killed more people than the right handed.