I think the big issue with the killings was HOW they were done, not just that they were done.... even in an abattoir, the animals do not know what is happening. there is general confusion for them, yes, but they cannot see or smell the carnage directly. this would have been extremely distressful (assuming the press hasn't exaggerated on a few details... now, why would they do that?

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Then, I think you need to put it into perspective - so many animals that (for some reason that you nor I really know or have a say in) had to be disposed of, so little resources to do it, and a lot of people not willing to do it. So, how is it going to happen. is it better they left them to rot or keep them in inhumane conditions?? one wonders what is the lesser of 2 evils here...