I think the issue is that the enforcement happens in the West, and not so much that it happens. There are big law firms that stand to make a lot of money from the litigation. Furthermore there is likely a contractual obligation that this be litigated in the West. All of which incentivises buying up dubious debt that needs to be run through the legal system, basically it pays twice... see (mjfl's comment above)

Furthermore, in the context of western exploitation/interference with these countries' economies, many of whom have not had recourse to a judicial process for reparations - your notion of what is rightful or fair is perhaps too narrow.