Seriously, It's faulty logic and apples to oranges.
Cars are designed to transport people, and while dangerous, that was not and never was the intent of designing it. It was designed as a technology to ultimately better society and commerce.
Guns were designed for only one purpose: To kill, damage, destroy, or obliterate whatever is in the path of the bullet it fires. It has no useful purpose to society, other than to kill a person or people. We use them to fight wars (kill), to hunt (kill), and to shoot targets and inanimate objects (damage, destroy, obliterate).
No car was ever designed to do any of those things, with exception to tanks and deathrace 2000 cars, both which are not legal for civilians to own.