“All those people who took up arms against the US in 1860-1865 were committing treason.”
You could say the same ting about the Revolutionary War, so do you hate this nation, too, because it was started by treason?
I accept the reasons give in the Declaration of Independence as adequate to justify their actions.
I reject the reasons given in the documents of the pretended confederacy as inadequate to justify their actions.
Clear enough?