Good thing, of course. The internet has the power to amplify a small message into a massive one and can trivially be used for evil. There is an argument that forcing people to use private chats prevents this stuff from getting out in the open, but come on, the NSA has a back door in everything. There is more harm done letting those messages out into the public space where there is a chance of radicalizing more people, or at the very least making that sort of abhorrent speech more normalized.