Communism is just impossible to implement. It only takes one human's greed to destroy the system. Center-left is far more plausible where the economy is capitalist with lots of checks and balances to counter extreme capitalists' greed and the state having control over essential industries and important parts of the economy (energy, water supply, transportation, education, healthcare and stuff) while abolishing religious systems to nil the discrimination on that end.

The entire concept of life itself is very capitalist — You have to exploit all resources available to you so you can survive and thrive. Only some species share resources — that too if they are in abundance for them.