Why does your "philosophy" have to presume that such hypothetical uncomfortable discoveries are actual fact? Why can't you accept that we don't understand genet

Why does your "philosophy" have to presume that such hypothetical uncomfortable discoveries are actual fact? Why can't you accept that we don't understand genetics nearly that well and that human rights aren't based on genetics? Why do you believe that people who disagree with you are basing their philosophies on genetics? I don't believe a person with Downs Syndrome is entitled to fewer rights, for example.