Across the Echo Chamber, a Quiet Conversation About War and Race

Samara Minkin was already feeling rattled when she saw a Facebook post from one of her children’s former teachers seven days after Hamas killed or kidnapped more than 1,600 people in Israel.

“The actual history of this situation is NOT COMPLICATED,” Sanidia Oliver, 37, wrote. “I will ALWAYS stand beside those with less power. Less wealth, less access and resources and choices. Regardless of the extreme acts of a few militants who were done watching their people slowly die.”

Ms. Minkin, an arts and culture consultant in Atlanta, bristled with...