Humans are productive without capitalism. If it rains, we build shelter. If we're hungry, we grow food or go find it. We make clothes to keep us warm or to cover ourselves. We make art. At no point in history has any society not been productive or not worked. The difference is that the people of those other societies got to keep the product of their labor. They didn't build a shelter and get paid 1/100th of the price and then were forced to live outside because they couldn't afford a shelter.

People are happy to work. They are not happy to work under capitalism. Under capitalism you produce and it is taken away from you and you get Chuck E Cheese coins that can only be used to pay the robbers for a fraction of what you produced. You build a skyscraper, you get a big mac. You build an airport, you get a hat.