Agreed. People often overestimate the value of truth.

While it's immensely valuable to have factual information and put that information to use, truth (or objectivity, we could say) is less important in one's mindset throughout life.

Take those who believed they were destined by God to succeed: they include Rockefeller, who developed pipelines to bring kerosene (and thus light) to the masses for cheaper, and even a favorite in the history of tech, Ada Lovelace.

The validity of their beliefs, or lack thereof, had no impact on their inspiration to pursue their goals or their ultimate successes.

This pull yourself up by the bootstraps meme has been powering the American Dream for a long time.

For some definitions of useful. Certainly useful if you find yourself enriched by chance and don't want to consider the circumstances of other people, less lucky.