Animal Farm - George Orwell

"Animal Farm" by George Orwell - illustrated book cover 
private project 2020

I started to redesign some of my favorite books and this is an illustrated book cover of George Orwell's "Animal Farm".
It's been some years now since I've taken interest in reading more about the history of the Soviet Union. "Animal Farm" may not be a history book but it is a perfect analogy of the rise of Stalin and the Soviet state. 
Growing up in Germany I've learned much about the atrocities that happened under Nazi Germany but not much about what happened in the Soviet Union. I'm currently reading Aleksandr Solzhenitsyn's "The Gulag Archipelago" which describes in great detail all the torture, horror and brutality that happened in the Soviet prison camps. 
It makes one wonder why people are still drawn to the ideas of communism and socialism when those ideologies have given birth to one of history's most inhuman empires that destroyed multiple lives in the 20th century. Many countries afterwards have tried to implement communism - all have failed utterly. Yet some people still argue that those countries weren't "true communist" states and that "true communism" would bring some kind of a peaceful utopia. 
What do these voices demand? Another experiment? Another chance? The sheer audacity to make such a proposition in light of all the millions of people who died from an ideological experiment renders me speechless. People are free to believe whatever they want but I just wonder...
How many more people have to suffer to prove that certain ideas only look good on paper...?