For one thing I know.

Sick, and degenerative people should not make children.

When sick, non-intelligent and non-strong people make kids the society becomes weaker.

People with schizophrenia and other illnesses that are spread by genes should not make children.

As being affected with many diseases I’m not making any kids due to fact that I want to help the society. My genes are wrong therefore there’s no need to prolong them.