So you think parents should not know and should not care whether their children will have an incurable disease?

According to Wiki: "Sickle cell disease occurs when a person inherits two abnormal copies of the β-globin gene (HBB) that makes haemoglobin, one from each parent". So basically this disease is encoded in DNA and it can be predicted whether future child will inherit it. Mandatory DNA screening could result in zero people having this disease (and other expensive to treat or incurable diseases). There will be no need to spend large money researching it, and those money can be used for more important non-genetic diseases.

Of course, religious people would be against this but we as a society should rely on science, not on blind faith.