Peter's aggressive tendencies have been well rewarded because his status as a professional football player has brought him significant emotional and financial rewards. Freud would suggest that Peter's football career is an expression of the defense mechanism:

Sublimation

Explanation:

Sublimation according to Freud is a pattern where an individual ugly attitude and character is converted or used for career or social event, to drive them to attain success in those areas. This can be found in the area of sports and other physical exercise, rather than fighting they convert the negative energy to put in their game which drives them with passion for success. This is the summary of Peter attitude which he used as a gain in his sports career.