Setting aside the fact that those protests end up smashing windows of helpless Chinese sushi chefs, rather than actual Japanese people, the PRC also doesn't leg

Setting aside the fact that those protests end up smashing windows of helpless Chinese sushi chefs, rather than actual Japanese people, the PRC also doesn't legitimately want to provoke an international conflict with Japan. They just want to keep the flames of national passions burning, so that they can command the loyalty and unity of their citizenry. If a Japanese expat got killed in some protest, it would be a major diplomatic problem and China might have to apologize, which would look bad.