There are only two occasions when I actually think about the killing, and am affected by it.
The first is when I have to carry out HD, for example on an RTA deer, or perhaps a newborn lamb that has a deformity and has to be KOTH at birth. Very mixed feelings, partly glad to have ended suffering, and partly remorse that it had to end that way - the animal should have lived to run another day.
The second is when I have to take a follow up shot on a deer. I'm sure I'm not the only one who feels that there is something abhorrent about shooting a deer that's lying helpless on the ground, particularly when there's a bit of guilt that I messed up the first shot.
Other than than those two examples, I don't give it a moment of thought, whether slaughtering domestic livestock, shooting deer or killing pests. The killing is just one very, very small (and, dare I say it) relatively insignificant part of a long chain of events that begins a long time before, and continues a long time after, you squeeze the trigger. And it's over in a fraction of a second. There's no time to feel either enjoyment or revulsion, the mind has already moved on to the next step of the process.
Think of everything that leads up to that kill: applying for a FAC, acquiring a rifle, accumulating kit, obtaining permission, learning the ground - it may take several years to get this far. And then there's the stalk, identifying the quarry, assessing safety, getting into a good shooting position - it may take several blank outings to get this far.
Then there's the shot - a split second.
Next, reload, cover the beast, eventually relax, walk over, check reflex, gralloch, extract, larder - another few hours.
A week in the chiller.
A day butchering.
Up to six months in the freezer.
Cook, eat, enjoy. That's the time for enjoyment. Enjoyment of the culmination of the whole long winded process - which included the act of taking a life as little more than an incidental part of it.