Dignity is not about self-confidence, nor is it composure and certainly not how one behaves in public.
Dignity is choice, and not the choices we make, but simply our ability to do so.
To remove choice from an individual is to belittle them and demean them. This is immoral. It strips them of their dignity. An undignified act is an act born in the lost of freedom.
When one carries themselves with dignity, one is holding true that the answer to the choice presented may have been right or it may have been wrong, but it was, at the core, made without direct or subversive force.
To strip a person of their dignity is an act of force. To strip it from a group of people is tyranny. Both are dishonorable, and the righteous oppose both with equal measure.