Because human beings have forgotten how to work, in case there is a disaster on the earth one day. However, if the whole world gives up paper records and physical and mental work, then people can finish their work and liberate the labor force by pressing a few keys. This benefit will greatly reduce the labor burden, and mankind will return to the primitive society and start again. It is difficult to save oneself after the disaster, and those labor materials will be destroyed with the paralysis of the network system. An intelligent robot like the one in the movie is impossible to realize.