TO use a car it must be registered. To drive you must have a liscence. If you lend your car, in Florida and many states, to someone and they injure someone, you are responsable. You can lose your liscence if you do not drive responsability or are convicted of a drug offence. You must be 16 to have a liscence. Many cars are not street legal and to produce a car it must pass safety requirements that make it safer.
Regulations need to be put on the manufacture and importation of Automatic Weapons.
People are still killed by car accidents every day, but the government can and does promote responsable useage. That can be done with guns.