Car insurance is mandatory to drive on public road. If you remain on private property, neither a license or insurance is necessary.
you may have missed my addendum. ‘before purchasing a gun, one has to show evidence of insurance’
Not sure how many drivers only use their autos on private property - but to get a tag you have to show evidence of insurance and if it lapses, the ins.co. will notify DMV. DMV will require your tags be surrendered.