4 firearms with ammo for each is not a “massive arsenal”.
Also they don’t note there’s no way in hell he’d be able to lug 6000 rounds around, much less fire them all. Nutball gave himself up with 5900 rounds left in his apartment.
Again all this example illustrates is INTENT IS EVERYTHING.
There are people who deliberately run people down in their cars and they have a legal driver’s license and legal plates. They may own multiple cars. Do we ban everyone else from driving or owning cars because of these idiots? Cars are efficient killing machines and you may not get caught, and if you do the sentences are less severe than if you used a gun.
Don’t forget those evil swimming pools.