Many, many psychopaths have a high IQ, as you state. Rudy is one damaged character. Sociopaths engage in reckless behaviour, they are glib and shallow. They make good con artists because they are good at mimicking emotions. However, they lack genuine empathy due to an inability to put themselves in someone else's shoes. Because of this deficiency, they can be ruthless and show a strange lack of remorse or compassion. They are users. Their only genuine emotion is rage.
Symptoms of sociopathy are casual lying, using people, and recklessness. They will often show asocial behaviour, crime, drug-taking and casual sex. They are master manipulators, who cause chaos wherever they go.
Avoid them like the plague, or they will bring you to your knees.
Sociopaths often show symptoms at an early age. For example, cruelty to animals.
As it is a personality disorder and not a mental illness, thus, there is little motivation for them to change their behaviour.
Bring one or two sociopaths together, or more (think Charles Manson, or Bonnie & Clyde) and the result can be particularly tragic.
Not all sociopaths are criminals, of course. There are many in business. When I come across one, I avoid them like the plague. These are the ppl who manipulate others to their detriment.