Because some parents are more concerned with how they look than actually bringing up their kids. Spend time with them, don't post their life on social media, understand their problems, then maybe they wouldn't be bullys to begin with!
It was not a continuous 5 miles it was split. Apparently her second time of bullying , wonder what the father did the first time. He should never have put it online it should have remained private. That girl will now be bullied from others who have seen this online. Suspicion why father thought it was a good idea.