I am not rejecting the sensibility or agreeability of the principle on its merits as a moral principle, but I do reject your characterization of any representation of responsibility as being a "descriptive fact".
I feel, unfortunately, that such conflations represent a thematic flaw latent throughout the argument.
Simply because we approve of particular facets of social relationship and social structure, we may not assert them as facts, transcending our preferences, whether individual or shared, except as that they are facts of our preferences.
The reason is because of much of what you have written, for example...
Various examples occur throughout your comments appearing as reactionary or liberal obfuscations of communism, and its differences with capitalism, or that seem unaware of general criticisms of capital.
You may feel my characterizations are inaccurate, and you may be correct, but I feel that they are representative of your argumentation, by its heavy assimilation of various tropes common within bad faith engagement with leftism.