It's much easier to feel outraged about animal suffering when it's somebody else's fault and somebody else who needs to change their behaviour. Which is one of the reasons why this story has given renewed vigour to campaigns to remove religious exceptions to stunning and for mandatory CCTV in slaughterhouses.
Thanks to the horse meat scandal tons of processed meat products are being removed from supermarket cabinets. The waste is huge. But the meat industry usually strives to avoid waste. Any part of an animal that can possibly be used for human consumption is made fit to eat, right down to the stripping of bones.
Fighting bulls are selected for their aggressive spirit. Like racehorses bred for the track they are highly prized and their welfare is paramount. Beef cattle, on the other hand, are bred and reared purely for meat. Only a very small proportion are kept for breeding - nearly all bull calves are castrated.