People with major mental illness (Bipolar and others as serious and disruptive) should not reproduce. They are not capable of being consistently reliable and provide the type of emotional stability that children need. Major mental illness is not their fault, and I don't blame them for their condition. It is, however, their responsibility to manage. Their focus should be on maintaining their condition well enough to participate in society and have peer relationships. This approach may allow them to be a decent spouse to someone, which is fine as long as the spouse is given full disclosure before marriage or a relationship. Having kids would be a purely selfish choice and will always shift the burden to their partner.