But this is not down to the type of ideology so much as the fact that they had more people to kill. You cannot jump from simple numbers to an evaluation. There are more factors.

Both are bad, no one is disputing that. I think Legolas is right that it does not quite work to equate the Spanish socialists with the Russian totalitarian regime. But I am not getting into this discussion. I just wanted to point out that you are oversimplifying. And oversimplifying never helps.