Royal Christmas Massacre

On Christmas Eve in 2012, 12 members of the Brittiania Meta Liberators broken into the estates and palaces of the British Royal Family, the security measures in each location bypassed at the same moment and over that night each location was rendered lifeless by each member, no human being was left alive each site was a brutal slaughterhouse and the only things left at each crime scene was a recording of the events showing that each locations slaughter was done by a single quirk user and made evident that there were no survivors. The recordings have never been made public even after the fall of the United Kingdom, rumours have it that the BML left it purely as a warning to the government at the time. 
Many members of the BML were arrested and prosecuted for this event many of which were used to further spark conflicts and hatred against the government and the quirkless oppressors.