Final answer:
Dr. Martin Luther King Jr.'s main concern in his Riverside Church speech was the social and racial injustices, specifically addressing the failure of white religious leaders to support integration on moral grounds, and emphasizing the crucial role of nonviolence and moral justice in the Civil Rights Movement.
Step-by-step explanation:
The main concern that Dr. Martin Luther King Jr. expresses in his speech at Riverside Church revolves around the injustice present within the realm of social issues, specifically racial and economic inequality and his pursuit of nonviolence in the Civil Rights Movement. Dr. King articulated a powerful message regarding the imperative of moral justice, the importance of unity, and the need for tangible victories to keep the movement nonviolent. He expressed deep disappointment in the complacency of white churches and religious leaders who failed to support the cause of integration on moral grounds, rather than just legal necessity, highlighting a wider disconnection between societal actions and their moral implications.
In one of his most profound remarks, Dr. King underscored that 'injustice in health care is the most shocking and inhumane,' addressing the broader concerns beyond just legal rights — the fundamental human right to healthcare. Dr. King's speeches emphasized a vision of equality, transformation through prophetic rhetoric, and a world that envisioned equal opportunities for all, irrespective of skin color. His approach to civil rights was deeply rooted in moral philosophy and the vision for a just society.