Probably less of an issue with a person's capability for forgiveness as much as the continuous tormenting of a child in their developmental stages will have a disproportionately heavy impact in their psyche.

The bullying may have also played a large role in building the bullied's sense of justice, and seizing on an opportunity to "do a solid" for that young defenseless and miserable child within you could go a long way to closing the circle on fundamental issues you have with the ability for any form of justice, civil or vigilante, to carry through and provide consequences.