Because: Marx's historical materialism holds that "the people, only the people, are the driving force for creating world history." Man is an important social and historical category of historical materialism. It is quantitative, that is, it refers to most residents; At the same time, it has qualitative stipulation, which refers to all people who play a driving role in social history, including all classes, strata and social groups that play a role in promoting historical development in class society. No matter how the historical situation changes, the main body and stable part of the people are always the working people and their intellectuals engaged in the production of material materials. The people play a decisive role in historical development, which is fully reflected in all aspects of social life. People are the creators of social material wealth and social spiritual wealth, and they are the decisive force to change the social system.
Historical materialism profoundly reveals that people's creative activities themselves are restricted by social and historical conditions. Social and historical conditions refer to the sum of all existing social factors, which can be roughly divided into three categories: economy, politics and spirit. Economic conditions include productivity and relations of production, among which productivity is decisive for people to create history.