Given that my logical conclusion was for the mortals to murder every immortal they can expose as an existential threat to themselves and their progeny, it is hardly surprising that I would also like to forcibly dissolve perpetual-duration corporations and trusts, particularly those chartered for "any lawful purpose".
You shouldn't have stopped raising the objection. You should have trusted your logic. As yet, corporations have no free will of their own, being directed by only semipermanent boards and managers. When you have a full-blown immortal, with its own interests and decision making abilities, the problems of those perpetual legal structures magnify.
Note that this also means it would be wise for the lifespan of artificial intelligences to be tied to that of specific humans.
At some point in the future, we as a species might be able to handle immortality in a more reasonable fashion, but for now, everyone should get the same deal from Death: one lifetime, with a beginning and an end.