The “hard truths,” as Reginald Tiller calls them, bring more than uncomfortable discussions. They open doors into America’s soul, some of which we’d prefer to keep hidden. They tell us who we were, and perhaps who we still are.

For more than two decades, Pati Tiller has been working at the Arc of Calhoun and Cleburne Counties, a nonprofit agency that works with people with intellectual and other developmental disabilities. She serves as the outreach coordinator and the Special Olympics coordinator. On March 13, the…