I fail to understand how this made the front-page of HN. A father sent an email to his children expressing his disdain. Email went viral in a way unanticipated

I fail to understand how this made the front-page of HN. A father sent an email to his children expressing his disdain. Email went viral in a way unanticipated by the daughter who made the email public. Some lame exposition is given on the basics of positive re-enforcement. Nothing about this was interesting or mentally stimulating.