One might argue that democratic socialists would never lose an election, but this is wholly utopian. Marxist-Leninist states didn't lose elections, but they didn't have free elections. But now most of these communist governments have collapsed largely due to the terrific inefficiency of bureaucratic, state-owned industries. These were noted for their shortages and shoddy goods, with no chance for consumer choice. This brings up the third objection to government ownership it destroys competition and thus encourages inefficiency and corruption.
Political democracy depends on free competition between ideas, parties and candidates.
So too does economic democracy. Without a market system there is no hope for an efficient economy. We must come to recognize that command economies have been tested and have proven themselves to be failures and there is no going back. An objection to common ownership was made over two thousand years ago in Athens by Aristotle in The Politics as a reply to Plato's advocacy of communism. Aristotle believed in the superiority of the male as well as upholding slavery.