This would only be a fair standard if also applied to Communists. In terms of sheer historical body count, there is no rival.
And then, if you did draw ideological lines in the sand, who sets that line? Whom does it emcompass? Does it apply to religions? Do we exclude Christians and Muslims? Do we exclude anybody who ever said anything nice about Genghis Khan or the Achaemenid Immortals?
Establishing standards of tolerance is one thing, but defining where the lines are can be difficult, and possibly embroil anyone.
