From what I can see, of the 3 parades all the 'attacks' have been largely damage-free, symbolic, and aimed at targets that I think you would find legitimate: financial institutions, estate agents, southwark council offices got their windows banged on... 'small businesses' are not a target, but rightly or wrongly this cereal cafe has become symbolic of hackneys/tower hamlets gentrification...why that is is hard to unpick - i think theres something deeply flippant about the concept of a cereal cafe that resonates with the flippantry of gentrification itself - both cereal cafe and gentrification seem gleefully oblivious to the reality of the lives of people around them. Let them eat imported Fruity Pebbles...
Also worth remembering that what people choose to do at a protest like this is up to them: targets arent given the seal of authority by CW central commitee! - once something like this starts its in the people who attends hands.