Well the problem with that logic is that the Great Leap Forward caused a famine that killed people. It wasn’t the Communists kidnapping and murdering minorities for being different from them. An economic mistake is not akin to mass murder. Really lays out the difference between the left and right. When the left kills people, it’s by mistake. When the right kills people, it’s nothing but intentional and premeditated.
A death is a death, and on the whole left wing extremists have been far more destructive. Even worse when you dress it up as unintentional or for the good of society, because then you can’t argue against it. You’re not entirely wrong though, it is a tragedy of an entirely different scale. Communists are good at that.