Nico:
I think you have a very legitimate point with some species. I think what you are thinking of is more the large herd type animals such as gazelle, impala, wildebeest, zebra. For these species I would agree with you entirely. It is the weakest that usually fall prey to the predators, i.e. survival of the fittest.
However, what I am thinking more of is elephants, rhinos, giraffe and even the big cats. There is a decided reduction in numbers of some of these species (although KWS reports a 4% increase in elephants in Tsavo). Topi and hirola are two other species which should be saved at all cost - there are just so few of them left in Kenya.
There has been a marked decline in grevy zebra in the Samburu area. My friend Shivani, the lion researcher, is now collecting lion dung, drying it out, and then going through it with a fine toothed comb to try to determine if the lions are indeed killing the grevy. With so few grevy in Samburu, if one is found injured one would think it only fair that in order to help preserve the species veterinary help would be available.
It can also have a positive effect on the communities. The Sheldrick Trust just rescued an 8 month old baby elephant last week near Mt. Kenya that they have named Kenia. It was a Mt. Kenya farmer who reported and called for assistance. In the past the people of the area had just killed the animals. He had read and knew of the work the Trust does, so rather than killing the baby he got help for her. With more animals being saved and the word getting out, perhaps the people will come to look differently at the wildlife they live with. One can only hope.