Final answer:
Atticus found it acceptable for his children to be at Tom Robinson's trial because it served as a crucial learning experience about social issues like racism and injustice.
Step-by-step explanation:
In To Kill a Mockingbird, Atticus Finch believes it is acceptable for his children to be at the trial because he recognizes it as an important educational experience that they'll inevitably learn about. Atticus is aware that the trial of Tom Robinson is a significant event in the town and an issue of great moral implication. He thinks that shielding them from realities like prejudice and injustice would be more harmful than exposing them to these social issues in a controlled manner.