The point isn't to have "plausable deniability," it's that it takes far too long to put out new laws on every single stupid little thing that comes before a government agency.
Do you have any idea how much time would be wasted if Congress had to hold committee hearings on changing the "Male/Female" box on 4473s to "Male/Female/Other"? People complain about Congress arguing over stupid stuff now or not actually reading laws now, imagine if they had to read and argue over 500,000 pages of regulations on reducing the allowable amount of rat poo in your hot dogs from 4.8 parts per million to 4.79 ppm, or changing the proximity a drone is allowed to fly to videotape bald eagle fornication from 100 feet to 101 feet... Also, do you want "The shoulder thing that goes up" to be in charge of whether or not a binary trigger is a machine gun?
And the correct answer for OP's query is America's favorite pastime since we ditched dueling to settle differences -- sue them.