It's the difference between leading people who are asking for leadership and treating them like unruly children when they are trying to articulate issues in their own voice. In this case the crowd was expressing its dissatisfaction with the failure of the political authorities to keep their communities safe; they were critiquing leadership rather than asking to be inspired.

Context matters. The song itself isn't the issue; singing 'We shall overcome' might have been fine after a free and frank exchange of views in which the crowd had had a chance to articulate their grievances, and the politicians had had a chance to explain what they proposed to do about them, and common ground had been established.