Uh, by allowing their child to choose for themselves isn't that exactly what they are doing here. They are literally allowing their child to choose their causes on their own instead of imposing them on them.
Without repeating all my previous arguments ad nauseum, naturally, sex
does get chosen for you. It gets chosen in the womb, by nature. Neither the parents, doctors or children get to choose it. All the doctors/hospitals do is make an observation/potentially test and scan (x-ray internals) if it's unclear. This is not the medical field choosing for you. What you do experience is growing up and deciphering your gender association, which CAN lead to your sex being changed by medical intervention whether it be drugs or surgery. This is not widely accepted as a choice though, it's accepted as below, as a medical condition where to put it in layman's terms, is a person has been born with the "wrong" sexual organs/in the "wrong" body. Hence why it is the case some need or want high-risk hormone treatment/surgery.... That's not exactly showing sex is a social construct that people need to go to the lengths of taking testosterone/estrogen/etc and also potentially going under the knife. The whole basis of gender dysphoria existing is an acceptance that nature chooses sex for you during development, and very occasionally nature can get things wrong/cause complications. The baseline is accepting the reality around sex/biology/life and from there we can adapt to cater for and assist those in need of help when complications arise.
Outside of nature choosing all we have is very early attempts to research what
may influence the development of a fetus (if we're talking human led choice/consequence ~ such as medication/hormone intake whilst a mother is pregnant). Random variation/complication in birth will forever cause there to be vast differences if not medical conditions in children. On top of that, some things a mother chooses to do/intake into her body may have a consequence(s).
You can, however, have things like down syndrome where it's a variation in development but there's actually
no evidence it's influenced. Just random variation. (although a possible chance increase with the age of the mother, but that's not quite the same as saying an intake of chemicals/hormones may
artificially influence).
Sometimes nature just behaves in ways that are unexpected, with the key point being like it or not this sometimes simply gets decided for you during pregnancy. Medical advances are often able to scan for evidence of many conditions in the womb, but we haven't quite got to positions where babies "get modified" by intervention pre-birth. That is one hell of a slope ethically. Although, in some instances such as downs syndrome I think you'd find a lot of people would want it to be legal and okay to intervene. As I said though, ethically it's a minefield as many rightfully propose will it lead to a future of "designer babies", where humans are completely genetically modified? You'd have to hope not!
As for any response to this saying it's
cold-hearted science. I'd ask you to read my post on the last page about child upbringing if you think I lack compassion. I do not. What I do feel is there is very little productive value in trying to ignore/erase/modify our understandings of biology/nature and life. What is productive is honesty, and then from honesty moving onto how we deal with things, which outside of medical intervention does indeed have to be led by compassion and understanding. Some parents due to their ideological beliefs do walk a line of attempting to say out of compassion they will murky the waters of what is the reality around their children. I do not think that is potentially healthy parenting. Children should be brought into the world to learn to accept and have to deal with honesty and reality from day 1, and from giving them that acceptance of reality they can begin to grow and develop around it. It's not a social construct for this child to be honestly told their sex without it being framed as something they choose. There is still debating going on about this being completely to do with gender. It is not. The medical records/birth certificate and even card assign sex, not gender, and as it's said on the activist's website they want to delist gender AND sex.