Neither. The OP's point is that shootings consistently make headlines and occasion a lot of passionate debate, while grandma or toddler getting mowed over by a SUV or monster truck doesn't and as a consequence nobody really cares.
Instead of trying to make our streets safer, the USA has responded by not allowing kids to walk or bike to school and have insane lines of cars and elaborate drop-off/pick-up procedures. Paradoxically, all of the additional vehicles on the road makes our streets more dangerous.