I don't use LinkedIn for much more than a way for people to get a quick bit of info about me when they google my name, thanks to how high linkedin profiles rise

I don't use LinkedIn for much more than a way for people to get a quick bit of info about me when they google my name, thanks to how high linkedin profiles rise in search results. I don't use it enough to care who I connect to. I don't do anything on there. Why is the author so worried about people seeing who his friends and parents are?