Counterproductive?
NY banned them.
4% compliance rate.
Not a good sign when otherwise law abiding citizens would rather be felons than comply.
That has been my argument against arbitrarily slow speed limits. They imply that drivers are either stupid or suicidal. They also move the highway patrol from the "Serve & Protect" role to that of being the Enemy.
Engineers used to use the "85% Rule" - set the speed limit at a speed which 85% of the drivers are driving at or below. The assumption was that most drivers are neither stupid nor suicidal. This rationale gave us speed limits of 70mph on Interstates while driving a 1950's car with lousy steering and tires, compared to today's vehicles.
If the gun laws of the 1950's are deemed inadequate to stem 'gun violence', what has changed since then?
Evil men no longer fear the death penalty.
God has been 'removed' from public life and education, so men no longer fear God.
Music, movies, TV and the new phenomenon of Video Games glorify extreme violence directed at authority and innocent bystanders. The old "shoot-em-ups" usually showed that there were consequences to lawless violence.