This is actually a good analogy. Driverless cars will be good, but what one company claims as driverless car technology might not ever be good. For example you

This is actually a good analogy. Driverless cars will be good, but what one company claims as driverless car technology might not ever be good. For example you need complex machine learning algorithms (Well I guess even a naive bayes will do) for facial recognition. But facial recognition cannot be solved by some hardcoded logic like checking the relative sizes of two circles and a cylinder you assumed as eyes and nose. Like this example, it's possible self driving car is far difficult than just adaptive cruise control, or Tesla's radar looking two cars ahead etc. These are minor hardcoded logic and is no guarantee of solving the problem. Plus, a bad pharmaceutical drug only harms the user, a dangerous car on the road is dangerous to people who don't want them.