In the consensus perspective of criminal justice, the "organizations of a criminal justice system must work cooperatively to establish justice, not competitively" ("Consensus Model (criminal justice)", n.d.). However, goodness is a multi-dimensional relative concept, and people always have different and opposing interests that may cause position or role conflicts, so achieving this goal may be impossible in practical cases. Having one consistent system means that it may only be one-sided and only favors one particular group in the society.
On the other hand, in the conflict perspective, the "organizations of a criminal justice system must work competitively to establish justice, not cooperatively" because conflicts are inevitable. A society is consistently subjected to a process of constant change, which produces social conflicts. Moreover, changes in customs, political ideals and economic conditions may cause the criminal justice system to contradict itself. So this advocates the natural role of a dialectic processes ("Conflict model (criminal justice)", n.d.).
For me, a "true" system cannot be simply defined.