Reasoning behind Fujitora's current standing

This has been bugging me the past couple days. I'm personally very confused as to why Fujitora isn't doing anything to stop bird cage. Of all the Marines we've seen so far he is the last one to expect to let this happen. He has shown that his highest priority as an admiral is the protection of innocent lives and Doffy has basically turned the whole island into a slaughter house. I'm aware that he doesn't think removing Doffy from the warlords will stop things like this in the future and I totally agree with him. But that doesn't stop him from stopping bird cage now and just leaving Doffy in his position. Its like a doctor refusing to help someone because " They'll just die eventually anyway." The point is they are dieing now and hes doing very little to stop it. His speech to Maynard seemed like it was supposed to explain his actions but unless I've been reading bad translations it really doesn't. The only thing that I've come up with that is plausible is that he intends to let bird cage play out to show the WG that the warlord system needs to be dismantled. An ends justify the means mentality that would make him seem more villainous because until this point hes been the first admiral that seems like an OK guy. Other than that I'd love to hear any other opinions on the matter.