Been published before, but bears repeating:
Case history: A woman with chronic tuberculosis is pregnant. Her husband has syphilis. Of their three children, one is blind, another deaf, and the other suffers tuberculosis. Yet another child died in infancy. This child is at high risk for physical defects, will most likely have mental illness and eventually will go competely deaf.
Do you recommend abortion?
Congratulations, you've just killed Beethoven.