The bad guys could be multi-nationals, oil companies, big banks, globilisation, corrupt government etc. Often the blame is justified and some blame is certainly useful. But that is only part of the thinking needed. Complaint itself is a vote of confidence in those being complained about. You complain - they can put it right.
Young children have no power, so complaint and blame and 'fairness' are the only tools.
At some stage, however, it is necessary to become more constructive. There are already enough adult politicians.