Why are liberals against curing birth defects like homosexuality and transsexuality?

After all, we say we know what causes them, so we can detect it and cure it before the baby is born!
Update: They're caused by an imbalance of hormones while the baby is in the womb, they're NOT genetic. Ergo they ARE birth defects.
Update 2: All I see are trolls, no one acknowledging that there is no "gay gene" and that we've found statistically significant links between prenatal hormone balance and homosexuality and transsexuality. Given this, we can correct these balances.

Stop being trolls!
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