Capitalism or free trade has always been part of human existence. It’s like gravity or other Universal Laws: they are there whether or not you know it. But you are correct that Capitalism as a known economics system was not well understood in Smith’s day but it was known as trade. And as such it was poorly understood until Adam Smith. And yes like most college professors today Smith was wary of businessmen in general. As for Marx, no man has done more evil in the world than he from his bad ideas. The idea that workers are alienated from the finished products of their labor has been misused and continues to be misused to justify terrible actions by men and governments. “No one knows how to make a pencil”, but the artist and engineer and scientist have never hesitated to use one and share great ideas and discoveries with the world.