Because most of the ignorant south at the time didn't know shit about it being fought against slavery. Me and 100million + other firearm owners haven't killed anyone or used our firearms in anger..which harms 0 people... slavery harms a fuck load of people and you equating it to the 2nd is hilariously naive. Congress can't even get single payer healthcare past..yet you think we can ratify the constitution?
More people agreed that it needed to be than didn't...and again. That will not happen with the 2nd, because more people in the USA agree with it than don't. You're in the tiny minority that wants it repealed. If you don't like it, move to another country.