If someone has a serious hereditary disorder, should they consider the ethics of having a child?

I can remember getting angry with my mother when I discovered that schizophrenia is rampant on both sides of the family. (I have schizophrenia ) I asked her how could she have a child knowing this. At this point I'll point out I was extremely unwell at the time.
She said that she knew she and my father would give me all the love and support to be able to get through anything. Including mental illness.

Depends what it is and how serious.. but the thing is.. most of the time we don't find out until after we have kids.. and some would say that person still has a life and life is very precious. Even with a serious disorder, or a potentially dangerous one, that life is often full of happy moments and love.. and often the disorder can be managed.

It would be wise to seek the instruction and advice from several medical men or women who actively specialize in that particular discipline before she could even consider a decision.

hell yes, I was born with medical issues and by the
time I was 14 I knew I didn't want kids

on the other hand my cousin who has different medical issues
had a baby at 40 y/o and the girl was born with Down Syndrome

knowing everything I have personally get so bad when I see
people with serious medical issues have kids that end up
with medical issues themselves.

I have often thought so. For instance, I saw a mother born with no arms, and her child also has no arms, but she thought her life was wonderful enough that she wanted to pass it on. Her son, on television, had one of those tooth gritting smiles that look very fake. I think adoption, puppies and kittens are the route to take for some people.

ideally, yes. sometimes you find out too late.

That was my thought. Still is