Originally Posted by
Skalm
Correct, you can't down syndrome from having sex with someone that has it. But if you have a child with that person, your offspring can have it (or their offspring, or theirs). Thus you are passing the defective genetics. If you do not have offspring, you effectively stop that defect from spreading.
In the past, people did not have offspring with these individuals. This prevented the widespread shit we are seeing now.
Look at cancer for fucks sake. It is projected that from 2012 to 2030, the number of worldwide cases are expected to increase by 50%. That is fucking insane. This is because the genetic propensity for cancer is being passed onto offspring. Now, if everyone with cancer all of a sudden stops having kids, its not going to 'cure' cancer. But it would drastically reduce the number of future cases.
'Germline mutations in BRCA1 or BRCA2 genes increase a woman's risk of developing hereditary breast or ovarian cancers. The most commonly mutated gene in people who have cancer is p53. In fact, more than 50% of all cancers involve a missing or damaged p53 gene. Most p53 gene mutations are acquired mutations.'
Bad genetics....