Kindness movements toward a kinder more compassionate world are proliferating worldwide. One of the key challenges facing these movements is attracting and sustaining members. This research identified a range of dispositional, motivational, and contextual factors significantly related to participation in a kindness movement initiated on the Virginia Tech campus after the tragic shootings on April 16, 2007: the AC4P Movement. Strongly resembling existing research on motivational functions served by volunteerism, the present research identified five motives for participation in kindness movements: social action, gratitude expression, social enhancement, impression management, and protective. Additionally, regression analysis identified a model with five significant predictors of participation: required participation, history of traumatic experience, belief that society is in danger, extroversion, and social action motivation. Findings are integrated within the context of Geller's (2016) model of empowerment.