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Whether the idea behind the ideology is a good one, once it's been put in to practice we can see whether if it's good for humanity, or bad.
For me, communism works well on paper, but once you put humans in there with all their complexities and multitude of motivations, it always becomes a horror show. It doesn't matter if the idea itself didn't cause those killings, once people were involved it did.
I'm not drawing an equivalent of Nazism and Communism. I'm saying they are both are extreme and both should be avoided for the good of humanity.
It's a fair point that people used the ideology as an excuse, but communism as an idea didn't cause those killings. At it's heart communism is about equality, all people being equal, the fact that there has been genocides in it's name doesn't change this. Whereas a nationalist ideology like Nazism is very much about one group of people being more important than others. That's why they can never be equivalents.