Concentrations of power are bad for humanity
Concentrations of power in private hands is bad. Concentrations of power in public institutions is bad.
Physical, economic, and social resource control needs to be decentralized. Authority and primary reward should be reserved for people with skin in the game. Not in the hands of a few rich oligarchs, and not in the hands of unaccountable bureaucrats under a system that relies heavily on state ownership and control.
We need capitalism, with widely distributed ownership. Yes, there is a place for limited public ownership of certain assets, such as parks, roads, public safety and health. And certainly there is a massive public benefit in laws and regulations that assure human and environmental safety, common standards of weights and measures, and the integrity of currency and contracts.
You can fight it, decry it, make it totally illegal, but private marketplaces will ALWAYS develop. USSR, Maoist China, Cuba... wherever there has been an attempt to "destroy" capitalism, black markets pop up as a solution to government inefficiency in distribution of goods and services.
Just as a market remains for illegal drugs, despite the decades long war on them, private markets will remain in a socialist system. Tremendous amounts of energy and material resources might get poured into the elimination of these markets. And yet people will risk everything: their freedom, even their life, to be able to buy for a dollar and sell for two,