Please don't take any of this as me judging you for having an incest ship, just explaining where some of the squick/objections come from.
As far as it's been studied out in the real world, incestuous relationships generally come from relatives who have been separated, not those who've grown up as family-- Gonou and Kanan from Saiyuki are actually the perfect example of this in fiction, they were raised separately and reunited as adults. So you have to work extra-hard, IMO, to make an incest ship work when they've grown up together. (This is why I sometimes have trouble with Ed and Winry, honestly, especially in the anime.)
So some of the squicking comes from that, and some comes from the frankly horrible fics out there-- which is true of any pairing but for some reason people think of some freaky shit to do with Al's metal body-- and I think some of the squicking comes from the emotional aspects of it honestly. Physical attraction feels more irrational to us than emotional attraction, so having brothers-- on a purely emotional level-- rather fuck each other is doubly weird.
And the other thing is what makes incest so taboo; we're trained to hold those family ties as sacred, so the very strength of their bonds makes people extra-squicked when they're violated.
I can sort of see them as crazy hermits with multiple cats.
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As far as it's been studied out in the real world, incestuous relationships generally come from relatives who have been separated, not those who've grown up as family-- Gonou and Kanan from Saiyuki are actually the perfect example of this in fiction, they were raised separately and reunited as adults. So you have to work extra-hard, IMO, to make an incest ship work when they've grown up together. (This is why I sometimes have trouble with Ed and Winry, honestly, especially in the anime.)
So some of the squicking comes from that, and some comes from the frankly horrible fics out there-- which is true of any pairing but for some reason people think of some freaky shit to do with Al's metal body-- and I think some of the squicking comes from the emotional aspects of it honestly. Physical attraction feels more irrational to us than emotional attraction, so having brothers-- on a purely emotional level-- rather fuck each other is doubly weird.
And the other thing is what makes incest so taboo; we're trained to hold those family ties as sacred, so the very strength of their bonds makes people extra-squicked when they're violated.
I can sort of see them as crazy hermits with multiple cats.