The Cereal Killer cafe which sells expensive bowls of cereal to wealthy punters was targeted by masked class warriors campaigning against "gentrification" and nice things other people can afford but they can't. The violent mob smashed windows and threw paint at the shop whilst staff and customers barricaded themselves inside.
You can read for yourself how the far left justify their criminal behaviour on the Guardian website where one of the thugs tells readers that causing criminal damage and terrifying children is ok because lots of Londoners are living in poverty.