I think I somewhat understand why there exists stigma around mental illness. It can be very challenging to live with, not just for the person themself but for spouses and partners and living-in family members. 

But for all those reasons and more we also need to open up and talk about these things, to share family histories and genetic propensities so that people are more aware of what they can pass on to their progeny and whether it's worth it. So far I thought my family, possibly on both sides had some illnesses zigzaging through members; now so does his. Many of these are much more common than we as a society accept or acknowledge or can even imagine. And yet ppl keep having kids without thinking what they might be burdening them with. At the very least awareness of genetic propensities should help design and maintain safer environments when they grow up, so that the possibilities in genetic makeup don't necessarily become realities through triggers.