Bystander passivity has received increased attention in the prevention of interpersonal harm, but it is poorly understood in many settings. In this article we explore bystander passivity in three settings based on existing literature: patient abuse in health care; bullying among schoolchildren; and oppressive treatment of students by teachers. Throughout the article we develop a theoretical approach that connects Obermann's "unconcerned" and "guilty" bystanders to theories of moral disengagement and moral distress respectively. Despite differences between the three settings, we show striking similarities between processes of disengagement, indicators of distress, and the constraints for intervention that bystanders identify. In relation to this, we discuss moral educational efforts that aim to strengthen bystanders' moral agency in health care and school settings. Many efforts emphasize shared problem descriptions and collective responsibilities. As challenging as such efforts may be, there can be much to gain in terms of welfare and justice.