"Parents weren't held responsible for a bad roll of the genetic dice." BS. Obviously, a parent might not know that they carried a gene for CF and then they'd reproduce and have a sick child. But if your family has a high incidence of cancer, heart disease, or diabetes, you don't need genetic testing to know that the condition is heritable. Genetic testing may increase the parent's responsibility, but even without that, I'd hope that someone who knew they had a debilitating illness in their family would be smart enough to drop out of the genetic crapshoot and decide to adopt if they want kids.