The logic doesn't work because the two acts are not necessarily equal. Let's take another example: Would you equate the following items?

- Torturing an animal to death for fun.

- Killing an animal quickly and eating it.

They both end up with the animal being dead. Does that mean that they are equal and that you can't find one "disgusting and shameful" but not the other?

I wouldn't equate those two, no. But it's also worth mentioning that it's common in the natural world for prey to spend hours dying (and more rarely, days or even weeks). The idea that a 'natural predator' death means a quick death is a myth. Sometimes it is, sometimes it isn't.

Using that as an excuse for (or in defence of) your own actions is akin to saying "he's doing it, so why can't I?" though.

The point is that you keep making leaps of logic in order to knock down strawmen, rather than addressing the actual substantive arguments at play.

My point is that a pig in captivity that is treated well and protected from predators, oh and that happens to get tattoo or two, is still doing better than a pig out in the wild, which is subject to much worse things happening to it. The pigs in captivity even get health care!