Morality is discussed quit a bit in Das Kapital, making it part of Das Kapital whether you accept that fact or not. Dont believe me? Well then read it for yourself.
Surplus-Value is a moral argument. Marx even invents formulas to convince us that kids and adults working to long is immoral. The General Law of Capitalistic Accumulation is also a moral argument. "The consumption of labour power by capital is, besides, so rapid that the labourer, half-way through his life, has already more or less completely lived himself out." "Third, the demoralised and ragged, and those unable to work, chiefly people who succumb to their incapacity for adaptation, due to the division of labour; people who have passed the normal age of the labourer; the victims of industry, whose number increases with the increase of dangerous machinery, of mines, chemical works, &c., the mutilated, the sickly, the widows, &c."
In every chapter Marx makes sure to keep the theme as a attack on Capitalism and how damn immoral it was to him. "Think of the horror!"
So what you are asking of me is to take Das Kapital out of context and analyse just the parts that you want me too. It is very hard for me to guess what parts of Das Kapital is off limits to me to analyse (according to your judgement). Take Volume 3 Ch. 52: Classes am I too completely ignore that last chapter of Capital that Marx wrote?
And you tell me that there isnt any relation between Das Kapital and the Communist manifesto yet we can find much of this talk in it: "Vulgar economy actually does no more than interpret, systematise and defend in doctrinaire fashion the conceptions of the agents of bourgeois production who are entrapped in bourgeois production relations." Marx makes no attempt what so ever to disbarge his promotion and Confirmation bias of Communistic philosophies. No he embraces his Confirmation bias and puts it in the forefront of every Chapter in all three volumes. The entire three volumes can be summed up as propaganda designed to convince the reader to hate Capitalism. If Marx just wrote about the ins and outs of Capitalism then your argument that I must analyse those ins and outs would make sense. But Marx didnt just do that he set out to tear down Capitalism and replace it with his own philosophies on and how social change will destroy the Capitalists.
And well tendencies are subjective. Das kapital only asserts tendencies and what ifs. Marx predicts an outcome and like all good prophets leaves enough vagueness for some people to point fingers and see evidence. The question vexed in this thread is if Marx was right about Capitalism. The answer is yes or no depending if you buy into Marx's philosophies. I dont buy into his beliefs, so no, he was wrong. mind you that I only count what Marx actually gets credit for not what he observed in his own time. He doesnt get credit for being a historian, observations that he makes in Das Kapital were also independently observed by many others of his time. So unregulated Capitalism was known by most people to most likely take a turn for the worse sooner than later. The US Constitution was written in a way that recognized that unregulated Capitalism must be avoided. The denial of allowing nobility is one case of that.