Tests are not mandatory so people do not know or do not care about the problem. Also they should be done before conceiving a child.

That's false... there are mandatory tests the doctors do and they do inform the parents if there is a detected problem.

What tests are you talking about that should be done BEFORE conception!?

Supporting a test that says you have X gene and that might result in a problem so you can't reproduce is a ridiculous stance to have.

You seem to have no knowledge about current medical screenings and no regard for human liberty.

> What tests are you talking about that should be done BEFORE conception!?

DNA test that detects errors (invalid sequences) known to cause serious illnesses. I think everyone who is considering to have children, should take such a test because he or she can be a carrier of invalid DNA which can be inherited and ruin life for a child. People should behave responsibly.