Randolph Churchill had syphilis. He died from it. I'm not certain as to when he was infected ( but he DID have during most, if not all of his marriage to Jenny!); however, none of his children were born with it, nor with any defects.
Either your doctor friends are lying through their teeth to you, or you are lying through your teeth! The blood tests done before one is allowed to obtain a marriage license, is NOT done to detect anything other than syphilis and gonorrhea and in some states, one or the other disease is no longer tested for at all.
I'm married, my husband and I took the blood test almost 39 years ago. My daughter is married, she and her husband took the test almost 6 years ago. Everyone, but you, knows what these test comprise.
Some people, who have familial inherited diseases running rampant in their backgrounds, sometimes have battery of tests done, before they try to have a family, but NOT ever in order to obtain a marriage license.
The only one lying is you. I have relatives in the medical industry who told me this. I find this quite trustworthy.
You on the other hand have an agenda to push tyranny disguised as rightiousness (which it is not).