Humane killing, I imagine?

Stun gun or that bolt hammer thing right to the brain, over in a flash as far as the animal is concerned.

Far more pleasant than the natural way - 6 of us chasing it round the prairie chucking spears.

Just because it's better than "the natural way" doesn't make it humane. How is the idea of humanely killing someone unnecessarily who wants to live not an oxymoron?

There are ways to kill that minimize suffering. To counter your point, he only raised the animals to eat them, if he could not kill them they would never have existed. Is that superior?

If you lead a pig to a trough and feed it something tasty, then bonk it on the head from behind with a sledge hammer, they're dead before they even know it.

I hope I get to go out that easy.

Yep, it seems perverse that we force humans to die in ways (e.g. chemotherapy on late-stage cancers, irreversible brain damage) that we would be horrified by if we inflicted them on animals.