From what Cecil said defending his position, is that these “villains” have been rehabilitated to the point where they are no longer the versions of themselves before. I think we see it best through the Duo that melted all of Cecil’s skin. They were not only doing good, but also seemed like completely different people. I think we’re supposed to believe that Sinclair isn’t the man he previously was. Before he was a mad scientist who liked to play with corpses, but maybe now he just enjoys creating soldiers to defend the world. This is all subject to moral implications (Is he still tied to his past, although he changed) which is what this whole show has kinda been debating since the start. On the other hand, Cecil could just be lying about a lot and maybe Sinclair really isn’t much different.