So if the south are traitors during the civil war...

[FEMA Camp Administrator]

Fighting a war of secession would be idiotic for any northerner interested in slavery's end, as it would leave the slave states beyond their political control. The South seceded because a number of its leaders saw the writing on the wall with regards to the country's direction; the North had the economic and political power to dominate the country; pays to not be an agrarian, racially segregated banana republic, I guess.

[FEMA Camp Administrator]

I'd like to add here that a pro-secession faction existed in the South (among officeholders, mind you, not some random crank like William Lloyd Garrison) that promoted the cause of secession as early as 1850, and that this is exemplary of the fact that most grand compromises on slavery made by the United States were to appease the South.