Here is one thought to repeat again and again: an idea is birthed but then changes and ages over time. Its expressions are not only attributed to their semantic content, but to the actual realities in which they exist. They unfold through time both in accordance with their own internal logic and the logic with which they interact with material realities.
Did Marxism fail? Is Capitalism a failure? Well why wouldn't Mercantilism be a failure? Christianity? Paganism? Hunter-gathererism?
Built in these judgements are an expression of self. One allies oneself with or against these ideas, as one exists in relation to the material expression of those ideas, and judges them accordingly.
And so a birth - the birth of a novel idea - is made possible as an expression situated against an array of death and decay.
The source of the energy of ascent is the energy of descent, and vice versa.