Secession was treason and should have been treated as such.
One of America’s worst traitors, a man who had committed or condoned far worse acts against his country than Benedict Arnold, was allowed to go home after his brief detainment in Virginia. But even that lenient punishment was enough to elevate [Jefferson] Davis to Southern martyrdom. Rumors were spread throughout the South about his mistreatment at Fortress Monroe, although Davis himself said the stories were untrue. Until his death in 1889, he found a stronger voice in passionately defending the right of secession and extolling the nobility of the Lost Cause. He became, like so many of his fellow Confederates, an unreconstructed rebel. As one might expect, he never believed that he had committed a single traitorous act; in fact, he boldly, even arrogantly, affirmed that every one of his actions was legal and constitutional. Unlike Lee, he never sought a pardon, which is just as well because he probably would not have gotten it (although President Johnson, who was courting the Democratic Party at the time, could have easily caved in on this issue). But he also never uttered a single word of regret or remorse for the bloody revolutionary war he had willfully led against his country.It was and is unpatriotic to adhere to the Confederacy.