I think you're take is a bit off for multiple reasons.
First, people need transportation, not cars. For the vast majority of people, if you truly need a car, it's because your infrastructure was built in a way that doesn't provide any other modes of transportation.
Second, mass shootings aren't the intended effect of guns in the same way pedestrian fatalities aren't the intended effect of cars. Both cars and guns are providing some perceived value (personal transportation freedom and self-defense/safeguard against tyranny/national defense) with a significant number of deaths as a tradeoff.
Third, implying someone with a BAC over the legal limit for DRIVING is somehow responsible for getting killed while WALKING instead of driving is comical and darkly ironic considering drunk driving accounts for almost a third of traffic deaths in the US [1].
1. https://www.cdc.gov/impaired-driving/facts/index.html#:~:tex...
I would argue that cars provide a tangible value, and guns only provide a perceived / emotional value. Guns make you objectively less safe, and at enormous social cost. Cars are (unfortunately) necessary in a lot of cases for the economy to work, there is really no comparison to guns.