One of the problems with this sort of law is where it leads.
Where it leads is quite obvious, if you bother to look. It leads to the UK style system, which the gun banners would love to see implemented in the US.
It leads to licenses/certificates/permits = FEES, for approval. It leads to "compliance inspections (yearly? MONTHLY???) = WARRANTLESS SEARCHES
Ultimately, it leads to government officials deciding that there is NO safe storage at home, and you will be required to store all your licensed guns at designated "approved" locations, such as a registered, inspected, approved gun club or a POLICE station, or similar location.
From there, its just a tiny step to requiring a permit (and a fee), and valid reason for you to be allowed to retrieve YOUR OWN PROPERTY. And, gee, I suppose a background check EACH AND EVERY TIME you apply for PERMISSION to possess your own property.
And finally, some valid sounding reason to deny you your property. Sorry, no funds in the budget to pay an officer to run the checks and unlock the vault. Come back next fiscal year....
Or even "We don't have time for that....."
I would point out that the DC law overturned in
Heller vs DC had safe storage provisions, which included making it illegal to have a handgun loaded or even FULLY ASSEMBLED
in your home, inside the District of Columbia.
Don't think it can't or won't happen here, it ALREADY HAS, and do note that the DC law stood for over a decade before our legal system finally reviewed it, AND that it was overturned on a 5-4 decision. ONE VOTE, by ONE JUSTICE was all that overturned that law.
Like vampires, once you invite the government in, ONCE, they can come back whenever they feel like, and take a bigger bite of our blood every time they do.
It's NOT a "slippery slope", it's the trapdoor under the gallows noose ...