It's not hard to make things safer.  But sometimes people don't think about the tools they already have.  With a simple reprogramming of an engine computer and perhaps with the addition of a sensor or two, the Jeep that killed Anton Yelchin could have saved his life.  If cars were able to detect that their driver had exited, accidental rolling of a car could be a thing of the past.  If we're lucky, it will quickly become one.