Context: A hacker wearing a pink power ranger costume deleted a racist dating website live at the end of their 39c3 talk this year.
Video of the talk (together with two journalists) here: https://media.ccc.de/v/39c3-the-heartbreak-machine-nazis-in-the-echo-chamber#l=eng
(The link is set to English translation, original talk is in German. Deletion happens here: https://media.ccc.de/v/39c3-the-heartbreak-machine-nazis-in-the-echo-chamber#l=eng&t=2577)
Well the rationale is that they were announcing live to the world (and therefore also the website owner) that "all your base are belong to us". So instead of giving the website owner time to fix their flawed IT security they just deleted all the infected systems at the end of the talk (including some backups and admin accounts).