How Is God Merciful ?
Capability to kill whom ?
The people who made the gun knew that it has the power to kill someone.. because they knew the characteristic of that someone. Can the gun kill a rock ? No.. it can only kill a living being.
Let me try and show it by another example.. Can I be a good father without any children ? Is being a good father characteristic dependent on presence of children ? If children don’t exist, can I be a good father ? Would you call me a good father if I don’t have any children ?