Autos are very dangerous, even deadly, to people in the vicinity. For the very same reasons people need rules to cover operating an aircraft (which apparently you agree to), people need rules to cover operating an auto.
Your argument is as hollow and vacuous as the "why do you need a gun?
You're switching the argument to guns, now? You were the one who said: "Don't be rediculous (sic). We're talking about autos, here." At least adhere to your own admonitions.
The former is the admonition. The latter is a simile.