Yes, a self-driving car would probably be hacked in the future, plowing into pedestrians or drive off a cliff. However, what's the odds of that, compared to thousands of deaths caused by incompetent human?
"In 2013, 3,154 people were killed in distraction-related crashes." [Source just google it].
"In 2013, 3,154 people were killed in distraction-related crashes." [Source just google it].