America is not Most Barbaric Society in History, but . . .

The 55 million abortions since Roe v. Wade probably represents the largest loss of lives any society in history has ever inflicted on its own. More, it is perhaps the largest loss of lives any society has caused, period, whether upon its own people or upon another. 

I do not think it follows that America is the most barbaric society in history, but can see how someone might justify the claim.