At all events animal rights is generally considered to be a left-wing cause, something "progressives" take up, while conservatives disdain it.
Let's now make a switch, one that current rules of the game, based on left-right polarities, forbid. What about abortion? Opposition to abortion is generally accounted a right-wing cause. Again, though, they say that hearing the amplified sound of a fetus in the third trimester or witnessing a partial-birth abortion would be enough to change the minds of most "pro-choice" persons.
Thus we tend to avoid both abattoirs and abortion providers. We tend also to avoid comparing the two. But should we? A critique of one seems to suggest a critique of the other. Or conversely, perhaps both can be defended.
In the area of personal disclosure, let me indicate that a couple of years after she gave birth to me, my mother had an abortion. Instead of being an only child, I could have had a sibling. Or the fetus aborted could have been me.
The personal element tends to affect one's judgment on these matters. But isn't that as it should be?