On a larger scale I think he did the right thing. He stopped a war. (And I blame BS’ creators for wanting to be historically accurate for that. The war had been a good thing but it never happened so.) But how he did was pretty disgusting.
Honestly, I can’t say that I agree, simply because yes, a war is ugly. A war is a terrible, horrible thing that everyone should absolutely consider the very last resort, but things like slavery do not end peacefully. It’s all very well to say that Flint and Madi’s war would have cost lives, but the reality is that slavery cost several million more, and even if they were doomed to lose, rebellions, even failed ones, give others hope. They give people the idea that fighting back is an option, and eventually somewhere along the line someone will succeed, but not if no one ever stands up and says “no more.”