What do the ''errors'' Scout commits on her first day have in common with one another in To Kill a Mockingbird?

All of Scout's mistakes on the first day of school seem to
come from her penchant for defending the wrongfully accused. After Miss Caroline
discovered that Scout could read well above grade level, the teacher criticized her for
it and demanded that her father stop teaching her how to read. Scout responded by
defending herself--and Atticus. After recess, Miss Caroline blasted Scout for knowing
how to write cursive, telling her that she shouldn't learn this skill until the third
grade. Scout held her tongue this time, but when the teacher hounded Walter Cunningham
Jr. for having no lunch money, Scout tried to explain why. But she ended up accusing
Miss Caroline of "shamin' him," so the teacher "whipped" her with her ruler. The
children erupted in laughter at this, bringing forth the teacher from the adjoining
class to threaten the whole class. Like Atticus, Scout already had discovered a penchant
for defending the underdog.