Rubin is spot-on in his analysis of Martin Luther King, Jr.
He points out, as I have been pointing out, that western-left identity politics and its attendant "intersectionality theory" are deeply bigoted because they divvy-up the political sphere into degrees of deserving or undeserving based on a racialized and entirely prejudicial worldview.
As for socialism, very few Americans who are inclined toward it have the slightest clue what it means and there has yet to be a historical example of it that has worked and that has not resulted in slaughter, poverty, starvation, and misery.
My focus, as the readers here know, is on the unfortunate relationship between the western-left and pro-Israel Jewry.
I generally avoid advocating for broad economic regimes because I do not believe that I know enough about macroeconomics... or, even, microeconomics, for that matter - but if by socialism we mean that workers own the means of production then we are obviously talking about a form of authoritarianism.
Well-meaning, left-leaning, western socialists may argue strenuously to the contrary, but if legal enforcement of the workers' possession of the venues of production means that the government owns those venues that means blood, repression, and the stamping out of the individual.
Today's western-left has lost its way because it has given up on the liberal (and countercultural) ideal of the rebel. It values conformity and group-think over argumentation. It values ideological blinkertude over Abbie Hoffman.
Socialism has a dull appeal and the left has become as boring and mainstream and restrictive as Big Nurse is over Randle McMurphy.