The problem is that “homosexuality is not a choice!” is a mantra used to change the conversation and deflect attention away from the real issue. By protesting that they didn’t choose to be this way (having these desires and tendencies) they think we will forget that sexual activity is, in general, a freely chosen act of the will. No, we cannot quite pick and choose what arouses or excites us, so the object of our desire is not usually in the realm of choice. But by free will we can give our body a go/no-go signal to act.
It is like people who demand that contraception be a covered expense because, apparently, having intercourse is so fundamental to their lifestyle, and not anything that is optional or freely chosen, that their inability to control themselves necessitates someone else paying for their release from the natural consequences of their activity. I promise you from first-hand experience that chastity is not misery, nor is it difficult. It requires discipline and self-mastery, but aren’t these all useful qualities to exercise?
Homosexuals are called to chastity. That is not unusual because all of us are called to chastity according to our state in life. Marriage is not a vocation for homosexuals because true marriage relies on sexual complementarity and the ability to engage in conjugal love that is both unitive and procreative.
Children can be taught very simply that men and women are different for a reason. They were built for each other, they fit together in a particular way . This is a scientific, biological fact. God told us to be fruitful and multiply. We do that by becoming one flesh, and starting families and raising the children in the faith. Children deserve both a mother and a father. To take one or both out of the equation does violence to the family and a disservice to all its members. Supporting traditional families is in the best interest of children and mankind. Anything else is cultural suicide.