i can be wrong but here is a possibility:
1. You can't do a wrong or an injustice to someone who doesn't exist
2. John died last week. His best friend Sam decides to damage John's grave and defecate on it, and subsequently make up lots of lies about him. Sam clearly does John an injustice; Sam clearly wrongs him
Therefore,
3. John exists, even though he's dead
Therefore,
4. Existence doesn't end at death. In other words, there is life after death.
1. You can't do a wrong or an injustice to someone who doesn't exist
2. John died last week. His best friend Sam decides to damage John's grave and defecate on it, and subsequently make up lots of lies about him. Sam clearly does John an injustice; Sam clearly wrongs him
Therefore,
3. John exists, even though he's dead
Therefore,
4. Existence doesn't end at death. In other words, there is life after death.