It's wrong to try to sabotage others.
Jackson is up for promotion at work against his coworker Mary who has completed a nice project.
Jackson wants to get promoted.
Jackson makes a speech highlighting all of the hard work he's done over the years for Mary and Jackson's boss.
Jackson removes key elements of Mary's project making her presentation fail in front of Jackson and Marry's boss.
While Jackson gets promoted, Mary feels like she has been beat in respectful competition, and her relationship with Jackson deepens.
Mary is humiliated.