These areas created new land are in disputed sea among China, The Philippines, Vietnam and Taiwan. The tension over the territories would rise and Japanese government should not ignore the China's act.
China wants to seize Senkaku islands not only for natural resources but also for military purpose. Japanese goverment is facing hard time to deal with the issue, so Japanese people have to support their effort against China's behavior. We don't have time fighting over American military base issue in Okinawa.