The psychological disorder you are referring to is called "Antisocial Personality Disorder" (ASPD), also commonly known as sociopathy or psychopathy. It is a personality disorder characterized by a persistent pattern of disregard for, and violation of, the rights of others. People with ASPD may have difficulty distinguishing right from wrong and often lack empathy or remorse for their actions.
It's important to note that not everyone who has difficulty distinguishing right from wrong has ASPD. Various psychological disorders and conditions can affect moral reasoning and judgment. For example, certain neurological conditions or developmental disorders might lead to impaired moral decision-making, but they might not necessarily meet the criteria for ASPD. Proper diagnosis and evaluation by qualified mental health professionals are essential for accurate assessment and treatment.