How do we end traffic violence?

Robb Mason was killed by the driver of a white or silver sedan at the east end of the Spokane St Bridge right near this spot. Here is another one willing to do the same thing. Joe is clearly visible, clearly intending to cross the at the clearly signed crossing, with family and friends on the way to Seattle Neighborhood Greenways safe streets party. Joe has the right of way. The driver has an obligation to stop but does not care. How can we get drivers like this to care? Or, at least prevent them from committing this kind of violence?