why is it that humans don't practice natural selection? i mean that's the way things are supposed to work. if you're born with defective parts you die. it helps keep the gene pool healthy. if a person that is born with a life threatening disability dies then his/her dna is not passed on to offspring, therefore the defective dna is lost and effectively filtered from the gene pool. the same goes for cancer and other illnesses and conditions.

personally i think that modern medicine is more of a detriment to society than a help, but that's just my opinion. what are your thoughts?