You must have missed the point regarding slavery. It, too, was a cornerstone...it was even sanctioned in our cornerstone document. Stranger beliefs have been widely held and seemingly insurmountable. Take your victories where you can get them and don’t look to get game, set, a match on just one or two serves...that’s an impossible strategy.
Slavery was the “original sin” of the founders, for which a later generation had to pay a horrible price. It was a violation of the founding principle of the country, not a cornerstone. Read Abraham Lincoln’s Cooper Union Address, read the facts about the views of those who signed the Declaration and the Constitution and you’ll understand what I’m talking about.
Lincoln brought the country back to first principles.