Originally Posted by Yariv

what you're describing is completely natrual and in line with evolution. it's just not the best possible outcome that we would want. "we" means specifically those who believe nature is here to serve man (because god created man in his image, and nature to provide for man) as opposed to man is merely a part of nature with no special significance. nature was here before, and will be here after man is long gone.

it's true that we're perpetuating some diseases by keeping the 'victims' alive which allows them to reproduce and their offsprings keep the 'bad' genes in the gene pool. this is just a blip and will not affect the balance in the long run. human population continues to grow exponentially and will do so until things start to get too crowded. when that happens, food shortage, disease, war (africa style) artificial population control (chinese style) and other forms of natural population reductions that I can't even envision (like the antibiotic crisis you described) will reduce the rate of growth. not sure it'll be zombies but it'll be something .

every species affects the balance of nature. no doubt man has affected it more than other species. but the whole premise of evolution is that there is no predetermined outcome, goal, design, or plan. species evolve in reaction to changes in the environment, and at the same time every species affects the environment. arguably man is the only species that doesn't have a natural predator, and what you're saying is that man is becoming his own predator... that's doesn't go against evolution or 'prevent' natural selection. on the contrary.