"O.J. is almost a textbook definition of what psychologists call a narcissistic personality," said Saunders. "He seems very deficient in terms of a conscience and a capacity to empathize with other people."
Narcissistic personality disorder is characterized by feelings of grandiosity, lack of empathy for others, an inflated sense of self-importance and the need to be admired by others, according to the Diagnostic and Statistical Manual of Mental Disorders.
One possible motivation for Simpson's recent actions could be money. Though he was acquitted in his criminal trial, Simpson was found liable in a civil trial for the wrongful deaths of Brown and Goldman, and ordered to pay about $38 million to their families.
Even so, the memorabilia said to have been taken from the hotel room is reportedly not worth all that much. Welner said Simpson may feel a sense of being violated by the sale of his personal belongings, which reportedly included his wedding video.
If Simpson believed that the memorabilia rightfully belonged to him, he might not consider or care that he could get in trouble with the police.
"He would not actually look at legality or ethics as an impediment to returning them to their rightful owner," said Elliot Atkins, a forensic psychologist. "If he wants something bad enough, those things don't get in his way."
Atkins also suggested that Simpson could be acting out of feelings of guilt and a need to be caught. "A lot of these things are very self-defeating," he said.
Others, however, saw things differently.
"He just thinks he can get away with it," said Saunders.