The part in bold undermines your entire argument. To criticize anarchy because the Founders, as brilliant as they were, believed in limited government is faulty, because the idea of anarchy was very much undeveloped. This is especially true for market anarchy because, as you said, economic theory was just starting to be formed and understood.
It could probably be argued that, without the Founders, individualism and laissez-faire would not have had the movements they did in the 19th century. We may as well respond to your original question with: "Well, Thomas Jefferson didn't fund space exploration, so clearly NASA is bad."