On the contrary, the explanation is far more straightforward: capital won. Sometimes with armies, sometimes with persuasion, sometimes with money, and sometimes by accident, but it won. For at least the last thirty or forty years, and this is increasingly true in nominally "noncapitalist" nation-states like China also, capital has proven richer, more powerful, more expansive, more convincing, and more real than any other political economic force on the planet. It is not a myth, it is not an elaborate hoax, and its wealth and dominance are not fictitious or illusory. Unsurprisingly, therefore, it has written the political economic rule book by which the world plays, and defined the terms and means by which one might "legitimately" break those rules. Socialists may have lost their ideological fire, or they may have read the writing on the wall and decided that given the options available to them, and the ultimate political and economic objectives to which socialism aims, i.e., the long-term betterment of citizens' everyday lives, their constituencies had to play by the rules, and the rules rule against being socialists.