Hahaha. I almost missed this tired argument. Ok, so the Communism that has been practiced by Communist nations has not been real Communism. So what???? You could probably say the same about "real Nazism." .... Darn that Hitler, he fucked it all up. That wasn't real Nazism. LOL what difference does it make? Hitler was a Nazi, and look at what he did. Stalin and Mao were Communists, and look at what they did.
Whatever pure theoretical form of an ideology you've got, it's NEVER going to happen in the real world. Maybe in a microcosm social experiment, but not at nation-scale. Human nature (greed, corruption, politics, lust for power) and the realities of the physical world (food, water, infrastructure needs, wars/defense, natural disasters) will always force an ideology to compromise. We don't practice pure capitalism, neither Hitler or Mussolini presided over pure fascism, and there's never been a country that follows 'real' Communism. But the track record for the countries that adhered to Communism throughout the 20th century is tragically clear. Hitler and the Nazis killed millions, but Communist governments have killed tens of millions.