But if this animal is a keystone species, then we have to do what it takes to build up this animals population. Because the balance of the ecosytem depends on it.

I agree their is nothing unnatural about what we do. But we are stealing the homes of the animals, plants, insects, whatever that was living their before us, so we should at least be kindful enough to contribute in builiding them more homes. Besides, you wouldn't like it if I knocked down your house, took over land, and left you standing their with the clothes on your back.

Animals and plants has provided us with the medications we need in order to survive. For example, the rosy preiwinkle has saved countless children with leukemia and other diseases. Most likely has saved someone in your family. They try their best to maintain the pest control that we created by killing all of the predators that eat the prey. Take for instance, the mosoquitofish and dragonflies. Both of them eat mosoquitoes, and is on the verge on being classified extinction because of us. If these insects would still be blossoming in our area, we wouldn't be having the mosoquito problem and the deadly diseases they carry everyday. The problem is that people don't take the time out to see why these animals are so valuable to us. They can help us uncover so many cures, remedies, and even herbs that can keep us alive to live another day, but we can't discover their mystery if they are extinct.