Hi
You asked for my comments and because I can't resist giving my opinion on anything
here you go. I want to say right away that this is a very rich text with many important questions and many (like the American Civil War) can't possibly be done proper justice here. So, here are my immediate thoughts broken down by relevant section:
1) I think your reading of Marx is too determinist here. Marx realised the possibility that revolutionary periods could end in common ruin, rather than an automatic progression. I don't think he saw an automatic trend from ancient -> feudalism for example. Feudalism was not born from a true revolutionary conquest of the roman empire but from its complete collapse. It's true he saw capitalism as a progressive force in many ways, but this was largely confirmed by historical reality.
With regard to workers fighting for their own interests, I don't think Marx can be accused of ignoring this. And regarding the American civil war, this wasn't so much a battle between two capitalist states but a class war between a the pseudo-feudal south and more developed north. Should workers not have joined the fight against the church and the monarchy in Britain, or against absolutism on the continent? Although the Civil War was dreadful it's nowhere near on the scale of the World Wars as I'm sure you'd agree. The victory of the North also expanded the proletariat massively by abolishing slavery. The other question is, given the lack of development of even the western world at that time would a truly world wide human community have been possible? Could capitalism have fed the entire planet? If the answer is no, then communist revolution cannot be on the agenda and thus its futile for workers to expect it to happen immediately.
This doesn't preclude workers struggling for their own interests but those interests are not necessarily exactly the same as they would be in decadence. Was it not in workers interests to gather their black brothers in the South under their banner? Did not the war, in some sense, serve both workers and capital? Just as the growth of education, etc. served the interests of both classes, even if workers had to fight tooth and nail for it?
2) Can't see much to disagree with here on the surface but if you look at what the ICC says in its decadent pamphlet it points to the development of the struggles of the exploited classes as a sign of a decadent period. But the cause of decadence, the thing that pushes these struggles, is located in the social relationships of capitalism as a whole. Is not the class struggle driven by a development of society as a whole? Is not the working class one of the productive forces that capitalism can no longer develop or contain? I think the theory of decadence is more nuanced than your text implies here.
3) I think when you talk about "the programme of the communists today is not a result of a direct progressive development of the ideas of Marx ..." etc. you're making the mistake of confusing the method with the conclusions brought about by the application of that method. Marxism supports unionism (critically) in the 19th Century, while rejecting it in the 20th, but this apparent contradiction is only such when you view these positions as dogmas, rather than the application of a consistent method to an evolving situation. The method of examining reality has not changed, but reality itself. The consistency defended by the ICC is precisely this consistency of method, examining society scientifically from the viewpoint of the working class.
I also think the comment about Lenin and Trotsky failing to break from social democracy is only partially true. At the height of the revolutionary period, 1917-1919, they and the Bolshevik current represented the clearest and most determined part of the proletariat on many issues. Their defence of internationalism, the most fundamental class position, was a beacon for the working class. It's true they made many errors which later went on to contribute to (but not cause) the defeat of the revolution, and there was certainly a retreat on many important questions, especially the role of the party.
But by posing the question in this way, you're contradicting your own points earlier about the revolution and class consciousness not being a dogma. Revolutionaries of that period, just like the class as a whole, had no historic experience on which to base their actions. Today, we have decades of union betrayals, of national liberation struggles being transformed into bloodbaths and - more importantly - the experience of the Bolsheviks etc. that show us the validity of the communist left's positions. But they had none of that. As I said on the original Trotsky thread, no group was completely clear on all questions. The ICC's platform for example is a synthesis of many different aspects of the communist left. From the Italian Fraction, it draws its fundamental methodology of organisation and the will to examine reality in a serious, rigorous way. From the German it draws on the theoretical insights towards unionism, the USSR, etc. But more importantly it rejects the confusions of these currents: the dismissal of Russia as a bourgeois revolution by the councillists; the attachment to a dictatorship of the party of the Bordigists. To expect revolutionaries to suddenly develop a precise clear-sighted understanding of the new phase of capitalism is, in fact, to see theory as being purely academic, a simply equation that if you put in the right data, the right answer will come out. In reality, consciousness develops both from the application and predictions of theory but also from historic experience.
Well, that's it! Hopefully this discussion will advance all our understanding of these questions.

Following the discusion on Trotsky, I thought I would post this. The third part has some relevance to the question as it concerns the idea of a continuity in the Marxist movement as the ICC see it. I would like to stress that this in no way represent the position of the EKS, but is a doccument in an intenal discusion written by myself:
Devrim