If all believers=Jihadist Islamists then all atheists=Stalinist Communists?

Antitheists tend to use reductio ad pessimum (elimination of all but the worst)examples when condemning the "evil of religion" but become quite inflammed when some theists do the same to atheists. Antitheists are rightly annoyed when some theists generalize wrongly by lumping all atheists together with Stalin,Pol Pot,Lenin and Mao,but antitheists constantly make the same wrong generalizations about believers. What do you think? Sweeping generalizations that isolate some facts and ignore the rest are usually falsehoods."Texts out of context are pretexts"