Homosexuality and evolution

Although I was glad to hear that this father was accepting of his son coming out, I felt like he tried to rationalize why his son was the way he was because he didn't know how to cope with the fact that his son was gay. James O'Keefe is a doctor, so I think he approached his son's sexuality from an analytical standpoint instead of an emotional/humanistic one. I understand taking an interest and being curious about the nature of homosexuality because it is something that we can look at from an evolutionary stance and question. Evolution is about passing on genes to future offspring and continuing the sire line. Homosexuality does in fact prevent the production of offspring from an evolutionary view. Now obviously in our day and age, we have adoption and in-vitro-fertilization, so it's not uncommon for homosexual couples to have children. Since homosexuality has been around since people existed, I think it's accurate to say that homosexuality is not a flaw in nature. Darwin did say that diversity is the key to genetic success. Dr. O'Keefe elaborated on how a mother can turn on certain genes that can predispose her offspring to homosexuality based on previous pregnancies and stress levels during pregnancy. That was something I did not know before. However, when started talking about personality traits, I think his execution was off. To me, at that point, he overgeneralized homosexual people and took a lot away from their individuality. We shouldn't overgeneralize. Other than that, I found the presentation to be engaging. I just don't think people need to get so caught up in the biological aspect of homosexuality because it's not a defect. It doesn't need to be fixed. I think people need to take a more humanistic and emotional approach to it so we can love and accept one another and coexist in a beautiful diverse society. That's just my opinion though. Let me know what y'all think!