Once you get more than 1 step removed things just get silly, and I don't just mean with firearms. If someone buys a car legally, and commits vehicular homicide

Once you get more than 1 step removed things just get silly, and I don't just mean with firearms. If someone buys a car legally, and commits vehicular homicide with it, the car salesman is still 100% innocent. If I buy a hammer from Home Depot and kill someone with it no reasonable person assigns even the slightest bit of blame to the cashier, or the manager of that Home Depot location, or the CEO of Home Depot. We can talk about systemic factors and the socioeconomic influences until we're blue in the face but "blame" should rest with the person pulling the trigger, behind the wheel, or swinging the hammer.