There was once a person, who illegally drove a tank on the mainland, and was killed by the police, after he wrecked a lot of property, motor vehicles, and wouldn’t stop. Civilians shouldn’t own a weaponized tank.

Military grade weapons, are not usually sold to civilians.

Any shoulder fired, rocket propelled grenade, fits the civilian exception law.

No belt feed machine-guns should be owned by civilians.

No firearms, that can shoot canon rounds, should be owned by civilians.

Etc...