It is rooted in Marxist belief. There the sole object is the class struggle of workers against capitalists. Everything else is subordinated to this because all other social ills, from racism and misogyny to homosexuality and religious excess, is held by Marxist doctrine to flow from the distortions capitalism imposes on human relations and behavior. There is therefore no social or cultural problem which cannot be fixed, and will not be fixed, by successful conclusion of the class struggle. Indeed, viewing struggles for women's liberation, for gay rights, to end racism, as the most important focus of any effort, is mere 'bourgeois sentimentality' which weakens the efforts to win the class struggle, and can even be seen as attempts to sabotage it. The description of homosexuality as a social ill is not mine, but the view of doctrinaire Marxists at the time 'Bernie' imbibed the doctrine, and criminalizing homosexuality has been a feature of Marxist regimes such as Castro's in Cuba. Marxist groups, especially on campuses, have over the last few decades learned they have to attach all these social issues to their agitation for class struggle, lest they find no membership at all. It is not possible to recruit young people to such groups nowadays if they do not strike postures in favor of feminism and anti-racism and gay rights. But look deeply enough, you will see this is always a means to recruit to the class struggle, which remains pre-eminent in the doctrine.
"From Bernies perspective, dropping out of a race once you have no chance of winning is peculiar behavior that can only be explained by the work of a hidden hand. For most politicians, though, it is actually standard operating procedure. Only Sanders seems to think the normal thing to do once voters have made clear they dont want to nominate you is to continue campaigning anyway."
"When things are not called by their right names, what is said cannot make sense. When what is said does not make sense, what is planned cannot succeed. When plans do not succeed, people become uneasy. When people are uneasy, punishments do not fit crimes. When punishments do not fit crimes, people cannot know where to put hand or foot."