There are very distinct, but controversial justices and injustices in Frankenstein. While some may think that a justice is being served, other may look at the action as an injustice. Be prepared to disagree with my own subjective interpretations of the justices from the novel.
In regard to the justices in the novel, I believe that they fall into one distinct category: that of "an eye for an eye". Therefore, many of the justices stem as reactions from others' actions.
First, the Victor decides to create life as part of a reaction to his thoughts that the scientific community was being unjust in regard to study. He did not think that his school's theology focused enough on the right sciences.
After creating the Monster, Victor fled. He could not face the fact that his monster was so hideous. Because of feeling abandoned, the Monster felt the need to find justice in his treatment. Therefore, once Victor refused to help him, the Monster had no choice but to change his mind. The Monster believed that Victor did him an injustice by abandoning him; he felt the need to combat this injustice by murdering those close to Victor in retaliation.
The execution of Justine shows a true injustice. Here, she is charged with the murder of William (Victor's brother). In reality, she did not kill William; the Monster did. This is one true injustice seen in the novel.
Many will argue the fact that the greatest injustice in the novel is the creation of the Monster. Man should not have the ultimate power over the creation of life. Therefore, some may consider Victor's creation of life as an injustice shown to women. Victor is taking away the one role assigned to women in the world- giving birth.