How come this group isn't more active?

Maybe because the lives of most Americans are so far removed from the place where most animals and human lives intersect: farming. My father was raised on a farm, by cousins had farms, I spent time on farms growing up and have had cows and chickens (as well as cats, dogs and birds.) I have met young people who have never had a pet. So, I will wade in with my perception and opinion, and maybe it will stimulate some discussion and thought:

I hold to what has been described as the native American approach to animals. I consider that all of us (humans and animals) are equally God's creations, and are entitled to life, and the conditions necessary to health and the expression of our physical (includi)ng mental/emtional) beings. As humans, we are a part of the food chain. We are (like bears and most scavengers) omnivores, and we require a fairly varied diet for health (our bodies do not synthesize as many necessary nutrients as vegetarians or other animals with more specific and limited nutritional requirements.
Jesus said that it doesn't matter what you put into your mouth (in response to Pharisees grilling him on dietary/feast legalities) because it just comes out the other end; what matters is what come out of your mouth, because that reveals what is in your heart.
I think that is true. I also think we should take no more from the world than what we absolutely need to subsist, and we should give thanks to whatever we have consumed (plant or animal) as it gave its life to sustain ours. Also, we should be glad to give our bodies back to the chain of life when we die (even if it is only microbes and worms, or, if we are cremated, back into the soil as flowers and trees.) We have a moral responsibility to provide a good life for any living things we impact. When our habits destroy habitats or cause unnecessary pain, we are culpable. The bible (old testament) has many areas talking about the requirement that we treat animals with respect. Our species has already so unbalanced our world, that it will take a great deal of study (to understand how life balances) and commitment to make this world the garden it was meant to be. We consume far too much protein in some places of the world, and don't have enough in others. All we can do as individuals is educate ourselves, and try to live our own lives well, and without harming others. It takes a very great effort as a part of our current culture to avoid harm - we have benefited by cheap imports (although it turns out they we really not so cheap) and most of our food is produced in ways that ultimately harm the earth. We need to continue to work on changing that - much of what we eat is not good for us because of the way it is raised. If each of us tries to buy whole foods, minimally processed, support local agriculture, etc., all of those small acts add up and will help to change the way we consume.