So the world used to be flat, and you could sail to Valinor in any old boat. But the Valar don’t like uninvited guests, so they changed the world to be round. Now Valinor is still in the same place, but you can’t get there, the ‘path’ you sail curves away from The Undying Lands. Only Elves can sail the ‘straight’ path off into the sky to Valinor, but only if the Valar allow it. So not only is it unlikely that an Elf would ever try to take the embodiment of evil to literal Heaven, but the Valar would simply not allow the boat on the straight path, it would sail around the globe.
Also even if an Elf tried to take the ring to Valinor they would surely be corrupted before the attempt and change their mind.
So the world used to be flat, and you could sail to Valinor in any old boat. But the Valar don’t like uninvited guests, so they changed the world to be round. Now Valinor is still in the same place, but you can’t get there, the ‘path’ you sail curves away from The Undying Lands. Only Elves can sail the ‘straight’ path off into the sky to Valinor, but only if the Valar allow it. So not only is it unlikely that an Elf would ever try to take the embodiment of evil to literal Heaven, but the Valar would simply not allow the boat on the straight path, it would sail around the globe. Also even if an Elf tried to take the ring to Valinor they would surely be corrupted before the attempt and change their mind.