Previously known as the "Abolitionists".
If the Confederacy was really "indefensible," fanatics would not have to resort to endless insults, such as you indulge in.
And the Republican Party of the 1850s was not the Conservative Party. It was a successor to the Whigs & the Know Nothing fragment of a party. If you are suggesting that men like Calhoun were not Conservative, you discredit your judgment to anyone who knows anything about history.
Conservatives are those who defend their cultures; not those who would change them. Words have established meanings--at least to Conservatives.