Is there a moral difference between killing animals for 'enjoyment', or killing and eating animals for taste/'pleasure'?

Almost everyone in this world, including most people belonging to all various religions, believe that it is morally wrong to inflict unnecessary harming on animals, yet how can we approve of the following?

Gary Francione: I mean that our thinking about animals is very confused. On one hand, we claim to regard animals as members of the moral community. We claim to embrace a moral and legal obligation not to inflict “unnecessary” suffering or death on animals. We can, of course, debate the meaning of “necessity,” but whatever it means, it must rule out suffering and death imposed for reasons of human pleasure, amusement, or convenience. If it does not do so, then the exception would completely swallow the moral rule.
The problem is that 99.99% of our animal use cannot be justified by anything but human pleasure, amusement, or convenience. For example, we kill more than 12 billion land animals every year in the United States alone for food. No one maintains that it is necessary to eat animals to lead an optimally healthy lifestyle and an increasing number of mainstream health care professionals tell us that animal foods are detrimental to our health. Animal agriculture is a disaster for the environment because it involves a most inefficient use of natural resources and creates water pollution, soil erosion, and greenhouse gasses. The only justification that we have for the pain, suffering, and death that we impose on these billions of animals is that we enjoy eating animal foods, or that it is convenient to do so, or that it is just plain habit.

“There is something bizarre about condemning Michael Vick for using dogs in a hideous form of entertainment when 99 percent of us also use animals that are every bit as sentient as dogs in another hideous form of entertainment that is no more justifiable than fighting dogs: eating animals and animal products.”
I recommend this article: http://articles.philly.com/2009-08-14/news/24986151_1_atlanta-falcons-quarterback-vick-illegal-dog-dog-fights
I also recommend this wonderful lecture: http://vimeo.com/17538152
Animal products are very bad for our health and causes many diseases: http://www.adelicatebalance.com.au/