It's raised because it was their reason for leaving. As to whether they had the right to leave, I've seen some Unionists saying that states couldn't leave at all, others saying they could with a Constitutional amendment, and others argue that leaving was permitted with the consent of both sides. Personally I go for the last method, especially since that was what James Madison said.
Some people are surprised that the Union had five slave states, and that they had no intentions of stopping slavery until two years into the war.
Some people believe that every single word of Baldwin's article is absolute fact. So what can I say? There are a lot of gullible people out there who don't do their own research.
A wife doesn't have to have a good reason for leaving, it is enough that she wants to do so. Perhaps she no longer loves him. Do you think a husband should force his wife to remain with him against her will?
and others argue that leaving was permitted with the consent of both sides.
Sounds like the Mafia. What sort of organization would you belong to that wouldn't let you leave if you decided you wanted to leave? I personally think free association is a component of "freedom", and that people can associate or not associate as they choose.
Some people believe that every single word of Baldwin's article is absolute fact.
People tend to believe what they want to believe and they often don't really care if it's actually true or not. I see the same problem occurring on both sides of the issue.