Nobody wants the return of slavery. That's why it isn't on the table.Why shouldn't slavery be on the table again? Both houses voted to end it and the president signed it. I think the USSC signed off on it too. In a Constitutional republic why should that mean anything? The second place finishers of that era were pretty upset about the slavery issue. In a republic or a democracy, should the wishes of the 2nd place finishers take precedent over the majority? Doesn't that make sense?
In contrast, the republicans never liked, wanted, or voted for Obamacare. That's why they don't want to fund it.
You are making an apples to oranges comparison.