What really bothers me about this, aside from the obvious psychosis of those involved, is the useless pain and torture these animals felt before their deaths. I've been a hunter for a number of years, and have known friends and family that raised animals for slaughter. And, if done correctly, they can be dispatched with little to no pain before the moment of death. It's just so unnecessary. That's not even to mention that some of these workers seem to enjoy inflicting pain, which is quite clearly psychopathic, or at least extremely disturbed.
If I were the owner of this slaughterhouse, I would be firing all of those involved in cruelty and investing in some education for new employees on proper methods of slaughter. That's what's so sad to me about this, is the sheer avoid-ability of it all...