Earlier quoted context omitted.
Indeed, this is the difference between socialism in a free market and socialism in a command economy. While the former may try to influence the market (through social programs, state investment, money supply), it still must bend with the winds of market forces. The latter is an imposition of structure irrespective of the market: It might be seen more as a rigid body that can stand in certain conditions but begins to…
There's no such thing as Socialism in a free market, that's a contradiction in terms. Socialism means non-free market, and uses extreme violence to accomplish its ends of nationalizing wealth and production (which are inherently linked). And indeed, very liberal applications of force is the sole means to accomplish such a thing, which is why all attempts at Socialism throughout history always involved the equivalent…
There's no such thing as a free market, either.
> Socialism means non-free market
Laissez-faire Capitalism ignores that the ideal efficiency of a free market requires the absence of externalities, which are present in the real world.
Socialism attempts to address the existence of externalities (though socialist theory often won't frame it in those terms) through compensatory mechanisms (which may involve outright government control and planned economy, or may, especially in many current strands of socialism, instead include mechanisms to internalize externalities so that the behavior of the imperfectly free market better approaches the efficiency of the ideal free market than an actually unregulated market would without effort to address externalities.)
> and uses extreme violence to accomplish its ends of nationalizing wealth and production (which are inherently linked).
Nationalizing means of production is not an end of socialism, though its a means of some forms of socialism in assuring that the means of production are harnessed to serve the common good of society. Other forms of socialism change (compared to capitalism) the balance of power in firms between labor and capital as a means of harnessing production to serve the common good, others adopt market regulations which serve to internalize externalities so that forces in the regulated market will naturally direct the means of production to serve the general good.
> Socialism requires at a minimum the nationalization of the means of production.
No, it doesn't, if you are referring to "socialism", the political philosophy. If you are referring to "socialism", a particular the phase on the road to communism in Marx's Communism (and thus the "socialism" of Leninsm and its descendants which, while abandoning much of Marx's theory, kept this part), then, yes, socialism does involve that, but note that Marx's Communism was one of many kinds of socialist philosophies of its time, and that the "socialism" phase in Marx's Communism (and, for that matter, Marx's Communism as a whole) is not representative of (though it may be one example of) socialism as a political viewpoint.
I think most socialists would agree that more democratic control of the means of production in general, as compared to laissez-faire capitalism, is a distinguishing feature of socialism. I do not think most socialists would agree that state ownership of the means of production is essential (and, indeed, many would argue that significantly revising the capitalist concept of ownership and property rights in the means of production are necessary to socialism, and that the nature of that revision of what ownership means is more important to socialism than where ownership is located. Socialism as simply state-ownership is a minimally challenging way for capitalists to approach socialism, because it avoids even discussion of the essential difference between socialism and capitalism, which is the challenge to the capitalist understanding of property and ownership.)