The destructive nature of socialism comes not from its tendency to trample on democracy (though socialism often does trample on democracy) but from its total disregard for rights — rights that are, in the context of the United States and other liberal-democratic systems, beyond the reach of mere majorities. We have the Bill of Rights to protect freedom of speech, freedom of the press, the free exercise of religion, etc., not because we expect that majorities will reliably support and protect these rights but because we expect that majorities will be hostile to them.
Hence the stupidity of complaints about our commitment to free speech protecting speech that is offensive, divisive, extreme, etc.: That’s precisely the point of the First Amendment — the other kind of speech doesn’t need protecting, because it is unobjectionable. Other rights — property rights and the right to trade prominent among them — also find themselves on the wrong side of majorities, constantly and predictably. But they are no less fundamental than the right to free speech, and they are no less necessary for a thriving and prosperous society. Socialism destroys societies by gutting or diminishing those rights. Doing so with the blessing of 50 percent plus one of the population does not make that any less immoral or any less corrosive.
Conservatives understand the case against socialism. But in a moment of ascendant populism, making the case for keeping democracy in a very small box — recognizing the difference between useful democratic procedures and a more general majoritarian democratic ethos — can be difficult. Those who have made a cult of “We the People” have left themselves without a very plausible moral or political basis for telling Them the People to go jump in a lake when they demand immoral and destructive policies.
Unrestricted democracy makes socialism worse, not better. Socialism denies the dispersed nature of knowledge that resides in communities of individuals not in elected elites. Rights protect the individuals that possess that knowledge that benefits us all. Democracy can subvert those rights. The two together is a recipe for stagnation and oppression.