Final answer:
Robert Zimmer argues that the most enriching education requires questioning and challenge, rather than silencing or disinviting speakers whose ideas differ from those learned in high school.
Step-by-step explanation:
Robert Zimmer argues that the most enriching education requires questioning and challenge, rather than silencing or disinviting speakers whose ideas differ from those learned in high school. He believes that a diverse range of viewpoints should be considered and engaged with, instead of being marginalized or considered invalid. This approach allows for critical thinking and the exploration of new ideas.