Isn't capitalism about building capital?

Just a thought, but as we look at the causes of the economic crisis, shouldn't we remember that capitalism is (was?) about building capital and not short-term, pecuniary gain? I'm not economist, but it also seems to me that the engine of functional and enduring economies is a large and vibrant middle class whose membership, as well as the membership above and below, is dynamic. Should that engine fail to start or sputter, then social upheaval is guaranteed. We know this. It's what drove the Marshall Plan and is central to our maturing doctrine and practice for building state-capacity elsewhere.