"If we had to slaughter our own meat, we'd all be vegetarian"
I'd disagree, personally.
The 'cruelty' as we sometimes see is with killing animals for food has a lot to do with the mass production, wholesale slaughter, factory killing of animals - at least in western culture. But because most of us never get to see the inside of an abattoir, it's a bit 'out of sight out of mind'.
It might sound like a little 'circle of life hippy bs', but I think people might have a little more respect for animals (certainly as food) were they to have to actually kill and prep them themselves - this might not hold strictly true for some cultures where religious observance dictates the method of killing (I'm talking about halal meat here), but on the whole, there'd be more of a connection with where the food comes from and perhaps more understanding or even recognition of the fact that it means the taking of another life to sustain your own.
I might not like the idea of killing a fwuffy wabbit for food, but I've done that before. Dispatching a cow would be no less meaningful, but it might present more of a logistical challenge.
I think perhaps most people who hunt for food approach it with two things in mind - economy of time and effort; you need to kill quickly and efficiently. Usually the fastest way to kill an animal is the most humane.
Then there's the whole 'thrill of the hunt'... if you've never hunted and killed anything for food you'll not really understand that. I guess it's something very evolutionary primitive and part of all carnivores instinct. In purely biological terms, the 'thrill' is simply the body's response to what could be a dangerous situation, where it needs to be at peak strength and agility and responsiveness; see massive spike in adrenaline and other hormones.
I know humans don't have to chase the prey down and sink their fangs into its neck to kill it, we have more modern means of hunting food now, but all of those biological preparations are still present.