Yes it is ethical; no, it is not an easy choice. I don't think it's a matter of ethics so much as it's a matter of being comfortable explaining to your child the situation and being comfortable dealing with its complications. If you can be comfortable rolling the dice on the possible condition of your child, I think you don't need to be worried about the ethics.
My unsolicited opinion is that the bigger issue is you being able to not feel guilty if you end up with a child with this disorder or with a child capable of passing it on. You know it's going to be difficult, and I don't think it would be fair to yourself or to your child to spend his life agonizing about the decision. If you decide to have a child, go with it and take it for all the good and the bad and don't beat yourself up over something that you had very minimal control over.
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