When I get in my car, I am doing (statistically) the most dangerous thing I will do all day. Most Americans have a car. Even if freeways are clear, it's rare to take a drive without seeing someone drive in a dangerous way. And when mistakes happen at 70 MPH, they can happen with grisly results.
Perhaps, because of just how much we drive as a country, we have become numb to horrific accidents. A fiery pileup on the interstate is fodder for traffic reports and the local news chopper. We hear about the wreck, we change our driving route and go about our days.
We don't dwell on it. We accept that if we want to drive, there are risks. There are drunk drivers. There are conditions we cannot control. We accept the dangers of driving as a necessary evil and we accept some regulation and enforcement of safe driving practices. In other words: we are accountable. There are dangers, we know them, we may try to prevent them, but we know the consequences of the car culture we have created and deal with the accordingly.
We have not done so with guns.