Actually I agree with you totally. Looking back at my post, it wasn't expressed clearly. My point is that when we see straight couples who are "dating or siblings", it's permissible and even funny to investigate the origins of their attraction style. This can be in contexts from poking fun to therapy. If you try to address homosexual attraction in the same way you run into problems very quickly, because now you're trying to 'reduce' homosexuality to a psychological disorder or something. I'm not going full-on conversion therapy here, but at least use the same standards when you look at sexual attraction and behavior (whether it's hetero, homo, bi, furry, whatever).The problem with this line of reasoning is that straight people are the exact same way. A lot of straight couples look so similar that there's a "dating or siblings" game that people play on social media. I think it's an evolutionary thing, most people tend to gravitate to those similar to themselves. Straight men are obviously fascinated by pussy and there's a huge community of straight guys who want a woman to sit on their face. Straight people also develop personas, big time. And last but not least, can anyone say that straight people are not fixated on sexuality?
I get where you're coming from but this can equally be applied to hetero people.
When I talk to hardcore Born This Way types, I usually cheekily ask whether it isn't homophobic to presume that gay people don't get to have the same psychological complexity when it comes to their pattern of attraction. Apparently we're supposed to believe a baby boy pops out of the womb genetically-programed to start craving cock.