I thought the same thing. Depends on how the question was framed. I would not support States rights to stay in the union and be able to enslave people. I would however support the ability of a state to leave and form their own separate country ... thus I would support the CSA ability to secede.
I would not live in a state that supported slavery. Thus if I lived in Mississippi and the choice was stay in the union/abolish slavery or leave the union & keep slavery I would vote for the former. This is all in the context of the 1860 debate.
Today’s situation is different. I believe every state should have the right to secede and form their own country and I’m ready to do that now if it could be done peacefully.
There is not a state in the nation where this could be done “peacefully.”
Our divisions today, unlike in 1860, are not regional. They are ideological and cultural, and they’re mixed across America. Even the most conservative state has a great many liberals, and the reverse is also true.
Any civil war in America today would not be a war between regions like the WBTS, it would be a true civil war, and would be much nastier.