Personhood is certainly not subjective in Europe, Boris. To be a person, you must be human being that was born alive. Whatever happens to you after that changes nothing. When you die, you become a dead person and many rights no longer pertain to you as you cannot be affected by them, but you have the right to have your death investigated and your corpse properly disposed of according to the law if that is at all possible.
The reason for that is simple. It is impossible for two people who occupy the same body to have equal rights.
Even very right wing, anti-choice states like Mississippi had to realise that. They do everything they can to prevent women having access to abortion, but they chose not to give personhood to unborn human entities, because even they recognise that chaos would ensue.