Which is why you keep different online identities that don't point to each other. So you can say the stupid jokes on your "sgt.lonelyheart97" twitter while posting on your prim&proper official account once or twice a year. Someone who really wants to will probably be able to connect the dots after enough digging... somehow. But at that point it's someone with vendetta against you specifically.
Two of the women mentioned in this article were doing just that. They posted pictures that the wrong people found offensive, got doxxed, bullied, and fired.
Which article did you read? Everyone in the article was demonstrating their innocence by doing things with their real names, with public profiles describing their place of employment.
Or just go and post on 4chan anonymously.