What is an example of Arnold being committed to justiice in The Absolutely True Diary of a Part-Time Indian?

Junior is committed to justice in several specific moments
that reflect a larger element of his character that is bound to the precepts of social
solidarity and compassion.  Consider his email to Rowdy after Reardan beats Wellpnit by
40 points.  Both his email and his overall feelings about how the kids from the White
school will experience a fundamental different trajectory in their lives than the ones
from the Native American school reflects how Junior believes in social justice.  At the
same time, his acceptance of his father's love as limited, but present also reflects a
sense of the juridical in Junior, as he recognizes that the ends of justice and fairness
are not always perfect, but rather are merely existent.  His refusal to attend mourning
services for his sister, who died of alcohol consumption, that will be heavily dominated
by alcoholic consumption also reflects a passion of being committed to justice and what
is right.  In the early phase of the novel, Junior' anger about learning from textbooks
that were "old" and his defiant resistance against this represents justice and a sense
of equality present.  The ending of the novel is another point where Junior's passion
for justice is evident.  He asks Rowdy if the two of them will still know one another
when they are old men, reflecting a sense and hope for permanence in a world that is
transitory, at best.  This is something that helps to crystallize Junior's commitment to
justice and fairness in a world that often denies such elements.