

First of all, Kant’s principle of humanity is just one component of his philosophy. Boiling down all of Kant’s corpus to saying that that that is it “in short” is ridiculous. You can’t just separate the principle of humanity from Kant as a whole. The categorical imperative is not just the principle of humanity. You also said that it is socialism plus Kant but didn’t even seem to read my explanation of immaterialism in Kantian metaphysics.
It’s because your thoughts aren’t inline with Kant’s actual philosophy and is an oversimplification of it to just one principal which bastardizes both what socialism is and what Kant wrote.