And some other country might be liking those Founding Fathers concepts' even more.
So? Doesn't change the fact that they weren't very good with not letting class/race/gender/etc position influence their policy making.
And that's the claim we're discussing whether they've been good at, not whether they came up with some good new concepts like "due process" and "the right to free speech".
They had "due process" but they also had slavery.
They had "equal rights" and voting but not for poor not land-owning plebes or women.
They had "free speech" but also McCarthyism.
Their constitution didn't prevent laws describing how e.g. blacks can't sleep in the same hotels or go to the same schools as whites to be applied and be considered compatible with it.
And didn't prevent a globally huge per capita prison system, primarily targeting blacks, even today.
You’re complaining about where the founders didn’t follow their principles to their logical conclusions. But you overlook that you’re using the founders’ own principles to criticize how they fell short. You can’t even articulate the complaints you’re making using concepts indigenous to Asia, Africa, or the Middle East.
You talk about slavery. But the countries those slaves were from enslaved their own people and sold them to America. The difference is that the founders created a system that ultimately precipitated in a civil war to vindicate the founding principles. One where (mostly British) Americans killed hundreds of thousands of their own cousins to free enslaved people belonging an entirely different ethnic group. Such mass fratricide for the sake of non-kin was completely unprecedented in history. Africans never did that. Middle Easterners never did that. Asians never did that.