We already restrict automobile ownership. We limit access to them. The government is constantly exploring and adopting legislation to make them safer, like seatbelts, speed limits, child safety seats, drink driver laws, laws against texting and driving, airbags and breathalysers.
We also make sure that only people who have received adequate training and have passed a road test are allowed to use them.
If guns were treated in the same way, where legislative efforts that would minimise gun deaths were embraced, then some form of gun control would be adopted.
Also, it is worth bearing in mind that the percentage of the population that owns guns is much smaller than the percentage of the population that is driving a car. 90% of Americans drive a car, while barely a third of the population owns a gun.
Considering both items kill around 40,000 Americans a year, that would indicate that guns are far more dangerous than cars. In fact, gun deaths are now exceeding the number of deaths from automobile accidents.
We would expect cars to kill more than double the amount of people than guns as more than double the number of Americans own them. The very fact that the two numbers are close demonstrates just how dangerous guns are.
Finally, we have to consider the function of both items. A car's primary function is a mode of transport to get passengers from point A to point B. As a result, almost every death caused by vehicles was an accident (around 94% of car deaths are accidental).
By contrast, less than 2% of gun deaths are accidents. A gun's function is to kill, injure or maim, be it an animal or human. Therefore the comparison falls apart.