To a certain extent guns are like sex. Once someone becomes sexually active they seldom voluntarily become asexual let alone anti-sexual. And so it is with people who learn to use guns in a safe and supportive environment.
Many anti-gun people are proud they have never fired a gun and vow to never shoot one. “Guns only have one purpose!”, they insist. They wear their ignorance with pride and yet demand they should legislate the rules of ownership. And so it is in some social circles in regards to sexual activities.
But most people would laugh and, at their most charitable, say, “How cute!” if monks who had taken vows of celibacy were demanding laws which regulated sexual behavior between consenting adults. “No one needs sex more than once a month!”, they might demand.
And once such people gained control government registration of each sexual union would be “just common sense” to reduce the transmission of sexual diseases. Sympathetic courts would rule that government had an interest in protecting the safety of the citizens and the registration law, no matter how unlikely to be complied with, it has a rational basis and hence overrides the non-enumerated constitutional right to privacy.
And of course many gun control advocates really are nothing but Puritans afraid someone somewhere is having fun.