<< People wildly overestimate how much other people care about them or their secrets.
People may not care about your secrets now. Right now you may be young. Right now you may have not pissed anyone off sufficiently to hire a private investigator to dig up stuff on you. Right now you may not be a party to a lawsuit.
All those things may be true right now, but things change. You have no idea how valuable right information can be at a given time. And here you are, volunteering it on a silver plate for anyone to pick as they please.
<<Nothing bad ever happened to me due to lack of privacy protection.
In other words, I think you are missing a key word here:"Yet". Nothing happened to you yet.