Today, Superman is commonly seen as a brave and kind-hearted hero with a strong sense of justice, morality, and righteousness. He adheres to an unwavering moral code instilled in him by his adoptive parents. His commitment to operating within the law has been an example to many citizens and other heroes but has stirred resentment and criticism among others, who refer to him as the "big blue boy scout." Superman can be rather rigid in this trait, causing tensions in the superhero community. This was most notable with Wonder Woman, one of his closest friends, after she killed Maxwell Lord. Booster Gold had an initial icy relationship with the Man of Steel but grew to respect him.