What's so terrible about Communism ?

I think capitalism as a primary mode of societal organization has served humanity well historically. The positive reinforcement associated with personal enrichment has supported a great deal of benefit to humanity.

But survival does not accrete to the strongest, survival is a virtue of being adaptable to changing circumstances.

We live in a world in which their is no regulatory jurisdiction related to the toxic outputs of industrial society. Carbon dioxide, microplastics, PFAS, etc .... are all polluting the globally shared environment and capitalism is anti-regulatory. We are destined to suffocate in our own toxic outputs if we can't regulate the shared environment. It seems communism (at least pertaining to the environment) is the only form of government which can provide the necessary regulation.