Moat countries require a license to drive cars. A white supremacist nation can certainly use that as excuse to take away the livelihood from certain classes of people. Is this a reason for not enforcing the need to have a driving license? (You do have driving licenses in the US right? I'm often surprised about the amount of things that seem universal and that are not a thing in the united states')
You do not in fact need a driver's license to purchase/own/operate a motor vehicle in the USA - only to use public roads. (And that's just talking about "by law" - "in practice" people drive with no license or with a suspended license far too often here)
People keep saying that the US is on the verge of being a fascist white supremacist state - why do you want to give that state the right to choose who gets guns?
Edit: and in more immediately practical consequences, because gun-hostile governments have a history of publicly leaking the list of people who own guns.