That's an assertion of belief, not a statement of fact. You'd have to bring arguments why the interests of workers and owners are congruent (which they are not).
I don’t need to do any such thing. Just point out that no reasonable alternative has been proposed by anyone and conclude that it’s therefore infantile whining.
German-style Rhine capitalism with co-determination for labor unions and a robust social safety net that isn’t even as leftist as the Scandinavian countries.
Who said I'm going around saying that? But it's still a reasonable alternative to the form of capitalism currently practiced in America. So you are incorrect in saying that nothing is being proposed.