Earlier quoted context omitted.
The difference is that in the national case, justice is expected; whereas in the international case, it must be understood that there is not supposed to be a "enforcement mechanism" that delivers justice.
In both case there are enforcement mechanism that deliver the will of the enforcers collectively which sometimes correlates with justice or at least a reasonable reading of the letter of the law; in both cases there are a wide set of failure modes from the perspective of law and even moreso justice, because law enforcement (and, in the case of concern for justice, also law making) rely on institutions ultimately comp…
In the international case, it is understood that the "law enforcers" are not obliged to play by the same rule. The "enforcement" therefore only applies selectively. Then the law cannot really be said to have been being enforced, because they don't apply to the "enforcer".