Because it's objectively unsustainable? I don't really get what it even means to be "pro capitalist" at this point. We know, for a fact, that capitalism will lead to disaster if we keep doing what we're doing. Do you disagree with that? Or do you not care?

What is your general plan for what we should do when we can see that something we currently do and rely on will have to stop in the near future? Not that we will have to choose to stop it, but that it will stop because of something being depleted or no longer possible.

If you imagine that we're trying to find the best long-term system for humanity, and that the possible solutions exist on a curve on an X/Y plane, and we want to find the lowest point on the function, capitalism is very clearly a local minima. It's not the lowest point, but it feels like one to the dumbass apes who came up with it. So much so that we're resistant to doing the work to find the actual minima before this local one kills literally everyone :)