Terry, the argument (at least from me....PETA might disagree) isn't that animals are being killed, but that virtually all other aspects of the company's practices are questionable to say the very least.
I buy buffalo meat from a local rancher in Wisconsin. As I drive to the barn/shop, I drive past acres and acres of open land where the buffalo live. I see firsthand what the conditions are. I talk to the very man that kills them. He can tell me what they eat, how they maintain the land so there is adequate and proper food for the buffalo, how the buffalo live, and about many of the buffalos' personalities, because its his livelihood to raise these animals to slaughter. And then he kills them for food.
Ok, yes, any killing is "inhumane," but its a fact of life for humans. From mastadons to cattle, we've been killing animals for food for eons. What's at issue here is how the animals have been raised and fed. When I can help it, I won't patronize companies that accept abusive practices.
Maybe not a fair comparison, but imagine you had two choices in life. One was to live your life relatively free, but you'd be killed when you hit the age of 40. The other was to live a life of abuse and neglect with horrible living conditions, and still be killed when you hit the age of 40. What's your choice? The animals we raise for food don't have that choice.
Disclaimer: Yes, I eat fast food once in a while, and I'm also fully aware that at some points in time I patronize a company whose practices conflict with my beliefs. I'm not perfect and claim no superiority over anyone. But some effort is better than none.