Good post Watson.
Now, in response to Sae,
It may not matter to a person that they felt pain before their death (it can't matter to them now, they're dead), but it certainly mattered at the time they felt pain and at the time you were killing them. And it certainly matters to others. Even though the person may be dead now and, say, they have no family members or close friends so no one is grieving, it is still best they are arrested, for very obvious reasons I would think. At least intuitively. One way of putting it would be that, someone who murders people (a murderer) isn't the sort of person you want roaming around free... they need locking up. They may never even do anything remotely like it again - but we can't see into the future and the best bet is people who do stuff like that certainly need locking up!
EvF
Now, in response to Sae,
It may not matter to a person that they felt pain before their death (it can't matter to them now, they're dead), but it certainly mattered at the time they felt pain and at the time you were killing them. And it certainly matters to others. Even though the person may be dead now and, say, they have no family members or close friends so no one is grieving, it is still best they are arrested, for very obvious reasons I would think. At least intuitively. One way of putting it would be that, someone who murders people (a murderer) isn't the sort of person you want roaming around free... they need locking up. They may never even do anything remotely like it again - but we can't see into the future and the best bet is people who do stuff like that certainly need locking up!
EvF