Karl Marx, Slavery and My Wish for 2019

Ok, I am taking this a tiny bit out of context, SJW style, but Karl Marx did write on December 28, 1846  in a letter to  Pavel Vasilyevich Annenkov:

As for slavery, there is no need for me to speak of its bad aspects. The only thing requiring explanation is the good side of slavery. I do not mean indirect slavery, the slavery of proletariat; I mean direct slavery, the slavery of the Blacks in Surinam, in Brazil, in the southern regions of North America. Direct slavery is as much the pivot upon which our present-day industrialism turns as are machinery, credit, etc. Without slavery there would be no cotton, without cotton there would be no modern industry. It is slavery which has given value to the colonies, it is the colonies which have created world trade, and world trade is the necessary condition for large-scale machine industry. Consequently, prior to the slave trade, the colonies sent very few products to the Old World, and did not noticeably change the face of the world. Slavery is therefore an economic category of paramount importance.

Again SJW style, my wish is that SJWs in 2019 put the above paragraph to the same scrutiny that they do paragraphs of those that they have opposed in the past, that they act consistently, and that they demand that all Karl Marx statues be taken down wherever they may be found, and that the teachings of Marx be eliminated from college and university courses everywhere.

Afterall. how can an SJW live with the teachings of a man who said that there is a "good side to slavery"?

Of course, personally, I am for open debate where no views are suffocated but I would like to see how SJWs, from their perspective, deal with this great Marx problem.

-RW