Apart from the question about weather a government should have the right to kill people when they are not immediately threatening someone else, I suspect that this would be an all too attractive option for disturbed individuals. Suicide by cop is already a thing. Commit and confess to some horrible act of violence, get all the attention that vulture media can give, and then die peacefully - allomst as a hero because of the money donated. I don't know, seems like it could backfire.