In his autobiography Asimov recalled that "when I wrote it [
The Caves of Steel
], I did my best to ignore this business of robots replacing human beings." Fear of such replacement had been ridiculed in
I, Robot,
where the difficulties of introducing robots on Earth was caused by fundamentalist religious groups and labor unions, and prejudices against robots were voiced by silly, ignorant, or malicious people. Asimov's resistance to the concept was understandable. If the novel was to work, however, much of the philosophic, even historical, development of the robot in
I, Robot
had to yield to new imperatives. Every person, even sensible persons such as Baley, had to be anti-robot, and yet robots had to be common enough on Earth for Earthpeople to fear their takeover of human jobs. After "Robbie" in
I, Robot,
Asimov had never allowed robots openly on Earth. This may explain, in part, why
The Caves of Steel
is set so far in the future. Asimov further rationalized the use of robots on Earth by placing responsibility for their increasing presence on Spacer pressure. As for robots replacing human workers, "that was typically Gold and not at all Asimov," Asimov said, " but Horace kept pushing, and in the end, some of it was forced in, but not nearly as much as Horace wanted.''