Charles, I respect what you are saying, but the Constitution, as far as slavery was concerned, was, as Garrison wrote, a compact with hell. The Constitution did not end slavery. A mighty civil war that killed 3 and wounded 5 of every hundred Americans ended it. The 13th Amendment was the result of the Civil War.
The Founders failed. However, Charles, I don't know if they could have done anything else.
Prior to the Civil War, slavery was a common, global practice. It was brought here from England, France, Germany, Ireland, and everywhere else that an immigrant left to come here. When slavery became an issue in this country, we went to war with ourselves and almost tore the Union apart.
I don't know.....
Maybe the FF were a whole lot smarter than you and I and realized that we needed to unite on the issues which we agreed on first, become independent, establish stability and prosperity, and then fight amongst ourselves over those issues on which we disagreed. Had they specifically abolished slavery in the founding document, maybe half the country would have said "Fuck that. Here is OUR document instead."
It was going to take everything we had to win independence from England, and maybe......just maybe.....fighting amongst ourselves at that moment wasn't a great idea. Until we were no longer under British Law, our opinion on the legality of slavery was moot, because the law that governed us prior left it perfectly legal.
Almost 100 years later, we took the issue up, after support for ending slavery had grown tremendously in the States and around the world. And even at that point, we were so divided on the issue that it almost tore the Union apart.
Had the FF addressed slavery at the onset, you would be sipping tea and playing cricket today, because the US would not exist. We united first on common ground, won our independence, then fought amongst ourselves on issues less significant. There were wise men at the time who understood that, acknowledged and accepted it, and created an environment where it could be addressed at the proper time.
And therein lies the beauty, and the power, of the US Constitution.....that it protects ALL people who it governs.
Even the ones who are a whole lot dumber than the guys who wrote it.