That video is very disturbing, but it is not the norm. Those men obviously have some mental issues that need to be worked on, and the owner should be shot for allowing them to do that to his/her cattle. I'm not against slaughter of any kind, I am however against the lacking codes that dictate slaughter. They need to be tightened and monitored strictly. Everything from the transportation of the animals to the actual killing of the animals, should be done in the most humane way possible to still render edible meat. The only thing that was accomplished in shutting down the horse rendering plants in the US was to ensure that those horses destined for slaughter were no longer killed in a humane manner. We can't control how the horses are slaughtered in Mexico or Canada, both of which still come to the US to buy horses for slaughter. We've also tanked the horse industry because now there are too many cheap horses flooding the market, opening the industry to people who before would not have been able to afford a horse to begin with. So now a lot of people have horses that can not really afford them, and have no idea of how to take care of them.
Slaughter is not bad, but inhumane slaughter is horrible.