Why can’t guns be regulated like cars?
Cars are basically regulated as follows (I rely below on California law, but to my knowledge the rules are similar throughout the country):
(1) No federal licensing or registration of car owners.
(2) Any person may use a car on his own private property without any license or registration. See, e.g., California Vehicle Code §§ 360, 12500 (driver’s license required for driving on “highways,” defined as places that are “publicly maintained and open to the use of the public for purposes of vehicular travel”); California Vehicle Code § 4000 (same as to registration).
(3) Any adult — and in most states, 16- and 17-year-olds, as well — may get a license to use a car in public places by passing a fairly simple test that virtually everyone can pass.
(4) You can lose your license for proved misuse of the car, but not for most other misconduct; and even if you lose your driver’s license, you can usually regain it some time later.
(5) Your license from one state is good throughout the country.
This is pretty much how many gun rights advocates would like to see guns regulated, and is in fact pretty close to the dominant model in the over 40 states that now allow pretty much any law-abiding adult to get a license to carry a concealed weapon: No need to register or get a license to have a gun at home, and a simple, routine test through which any law-abiding citizen can get a state license to carry a gun in public.