It wasn’t long before people started pointing out how Rayner’s policy has actually been enacted before. A civilian, Jean Charles de Menezes, was shot dead in 2005 by Met Police officers after he was incorrectly identified as someone involved with bombing attempts, obviously sparking some widespread backlash.
Article source: https://www.huffingtonpost.co.uk/entry/angela-rayner-policing-terror-twitter_uk_620e3dd3e4b097efdfbcec4c