Tribalism said:
There's only one scenario I'd wholeheartedly get behind this cure and that's if it was a "vaccination" that could be taken past puberty by the homo/trans person in question. In this sense, it'd be possible for some people to deal with the societal pressures of not being Cis/straight by giving them a way out that isn't a hole in a noose. However, just like male circumcision in America, I don't feel it's right to change someone's life so drastically before they have a say in it.
That said, if it was being developed, I wouldn't be against the idea. If it wasn't mandatory, the kid need never know s/he could have been potentially gay/trans and parents could opt into it if they decided they wanted to (similar to adoption). I would be against it being made law.
Now I'm not a parent, nor even considering at the moment (17 is a bit young for such things, wouldn't you agree). As such, I would not actively oppose the option being given to prevent the "development" of trans-sexuality or homosexuality in the womb. However, I WOULD be against such things being anything more than an option to parents. Any sort of encouragement or making it mandatory I would actively oppose. I would also actively oppose it being an option post-birth, since to make it so would be to avoid the issue not through acceptance of moderately-different-and-in-no-way-harmful-to-any-parties lifestyle, but by elimination of the lifestyle and thus allowing bigotry to win out.
If it isn't abundantly clear, I hate bigotry. I have never seen anything approaching any sort of benefit to undue hatred of any group of people based purely off of things that are not their choice (ethnicity, sexuality etc.), in place of merit (e.g. personal experiences with individuals). Someone stab you, they earned your ire. Someone has a darker skin tone than you and bigger lips? WHO GIVES A FLYING FUCK?!?! Some guy likes f******* guys? LET EM! It's okay when girls do it, why not men?!
Fucking bigotry. I've not lived it, though just by seeing the reactions of my father and paternal grandparents (the black side of my family, I can see the merit behind the tales of all of the shit they had to put up with for their ENTIRE LIVES just for having dark brown skin. You remember that scene from the star-trek re-boot where they congratulate spock on getting into the science academy "despite his disability", the disability being his human half? People ACTUALLY said things like that to my father upon his college enrollment.
Yeah that last paragraph was about ethnic bigotry rather than sexual bigotry, but it's effectively the same damn thing.
Sorry for the rant. Bigotry is just something about human culture I really wish would just die. Too much suffering for no purpose.