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.
Hence the saying: If you want to kill someone and get the lightest possible punishment, kill them with your car!
But to be fair, mass shootings get no policy changes.
Hence the saying: If you want to kill someone and get the lightest possible punishment, kill them with your car!