DigitalFrog: The reason is that the real saint Klaus was into helping others, and realized that children need accountability and families can use a little help, too: When a child had worked throughout the year to learn to act responsibly towards other children and their own family and the community, then they received a nice present; and if they needed some help to decide to sign up to be helpful to others, then the nice big lump of coal would be useful to keep their own family warm in the winter. Win-win.
DigitalFrog: The reason is that the real saint Klaus was into helping others, and realized that children need accountability and families can use a little help, too: When a child had worked throughout the year to learn to act responsibly towards other children and their own family and the community, then they received a nice present; and if they needed some help to decide to sign up to be helpful to others, then the nice big lump of coal would be useful to keep their own family warm in the winter. Win-win.