> fetus has some inherited disease
By your logic, if homosexual attraction had genetic causes, could it not also be seen as "some inherited disease"?
You're doing a great deal of question begging. You're beginning with an ideological stance vis-a-vis homosexual attraction that is exactly a point of issue, and then tailoring moral arguments to suit the position. You've confused "the position that homosexual attraction is disordered" with "hating gay people" and then unjustifiably construed "hating gay people" as not entailed by the desire to terminate a pregnancy for whatever reason, i.e., it's okay to terminate a pregnancy for whatever reason unless the reason is that the fetus is genetically conditioned for homosexual attraction, in which case it isn't okay because that would be an act of hate against gay people by virtue of my prior ideological commitments.
You must see the absurdity of that line of thought.
The position of sound anti-abortionists would be that no matter the characteristics of the fetus, the fetus is a human being and the killing of any innocent human being is immoral. Your position, on the other hand, seems to be very ad hoc, relying on special pleading that is driven by prior sui generis ideological commitments.