This is why I posted, "neither Washington nor Lincoln attempted to split the Union (we'll extend some license to Mr. Washington)." with that license a nod to your observation.
Here we part ways. That cause you mention was seen even then as--uh--'dubious', obviously. Nor is anyone suggesting these people be airbrushed out of the history books; Maury is a case in point: he'll remain in the history books for anyone who cares to open one to see. This is not so much a question of bravery as one of fidelity to a nation conceived decades before Maury--who, let's remember--chose to betray his oath to those United States. Again, Congress may have removed any sanction which may have been placed on Maury so the issue long since may have been addressed in his favor.
Otherwise, to honor Maury's breach of fidelity by retaining the current name of the vessel, a vessel which represents the United States and flies its flag, I might add--strikes me as thoughtless as it is distasteful.