Originally posted by /^Blackmagik^\
you're totally missing the point. the basic premise of natural selection is based on one thing. survival of the fittest. the weak are weeded from the herd. whether these people know they are defective or not is not the point. it's when they are treated and kept alive to pass on those defective genes to offspring that is the point. if it were not for modern medicine i think it would take only a few generations before the cancer rate dropped dramatically along with other genetic disorders.
while ultimately your theory may be true, what i just pointed out shows that the actual incidence rate of cancer is much higher than you think it is, you may even have cancer yourself one day. in addition, the other factors i described show that cancer is increasingly becoming a factor of our environment, our diets, our lifestyles, and our surroundings, and not so much genetics