Bernie Sanders' ideas are not vaguely new. There's a body of rational criticism you need to understand if you pretend to intellectual honesty.
"I remained a socialist for several years, even after my rejection of Marxism; and if there could be such a thing as socialism combined with individual liberty, I would be a socialist still. For nothing could be better than living a modest, simple, and free life in an egalitarian society. It took some time before I recognized this as no more than a beautiful dream; that freedom is more important than equality; that the attempt to realize equality endangers freedom; and that, if freedom is lost, there will not even be equality among the unfree."― Karl Popper, Unended Quest: An Intellectual Autobiography - 1976
"The nineteenth century was naïve because it did not know the end of the story. It did not know what happens when dedicated idealists come to power; it did not know the intimate linkage between idealists and policemen, between being your brother’s keeper and being his jailkeeper.-Eric Hoffer, Before the Sabbath - 1974
It is disconcerting that present-day young who did not know Stalin and Hitler are displaying the old naïveté. After all that has happened they still do not know that you cannot build utopia without terror, and that before long terror is all that’s left."