Earlier quoted context omitted.
>I definitely would not submit my kids to the same fate. You already have since your DNA is out there in a database.
That's not exactly how DNA works. Their kids should be mostly fine (99.99% similar is still night and day)
They caught him because a relative had submitted their DNA.
>Investigators compared the DNA collected from a crime scene of the Golden State Killer to online genetic profiles and found a match: a relative of the man police have identified as Joseph James DeAngelo, 72, who was arrested Tuesday at his suburban Sacramento home.
The same sort of scenario is possible for medical related things.
"John Smith has these health risks, oh look he's listed as the father of our client Jane smith so she likely carries these health risks. Adjust her rate/drop her policy".
That said, I willingly gave my DNA to 23andme & Ancestry.com, I find the stuff interesting and worth the potential future risks. Once whole genome falls below a few hundred dollars I plan to have that done too.