But when his country goes to war and many, many people agree and fight, why would America not fight? It's not the same as a Civil War, it's his people against others. With so many people in support of the revolution, including the "leaders" of the time, it's not the same to compare America fighting in the war to him being an extremely open anti-slavery activist in a time when most of his people would think he was crazy.

Yes, what I'm saying is that it was "universal" enough at the time that it's not a good comparison to make with that sort of activism in the same era.