Yes, it’s a twist on the old slogan ‘think globally, act locally’. Bear with it, though; it means something related, but also quite different.
There is a certain degree of equivalence between a Badiouian Evental Site, the situation of mésentente in Rancière’s ‘part-of-no-part’, Agamben’s State of Exception, and, (perhaps least of all due to its apoliticity) a Lyotardian Differend. I do not know whether it was Balibar or Agamben who first noticed this. There is an excellent article on the subject of the Evental Site here.
It’s sometimes startling to recall that Apartheid, slavery, and colonialism were all perfectly legal regimes. Even the Shoah was fully legislated for well in advance. In fact, a pre-occupying focus of genocide studies has been that the legal framework for acts of genocide always pre-exist the historical atrocities they legitimate, which constitutes in itself a formal, absolute, atrocity. Rancière is therefore far from merely sporting with language when he speaks of ‘a wrong that is right’: like Agamben, he is talking about situations of legally supported injustice. As leftists, whether we admit it or not, or whether or not it is explicit in our theoretisation, we are all dependent on a distinction between legality and justice. Without an idea or sense of justice, there can be no sense to revolutionary politics.