I'm not a historian -- I couldn't really tell you what the founding fathers were thinking when they wrote the Constitution, except that they had a specific agenda they wanted to see accomplished for the future. I'm sure they knew a lot of the groundwork they laid out for us would be difficult to implement right away. It's why slavery was tolerated for as long as it was, and why we took away land that belonged to people long before we got here.
I do know that, for the most part, we've looked back on those things we did with regret. There will always be people who don't, but the country on a whole has been able to understand that those ideas were a mistake. That the things we used to think was right, wasn't. We fixed those mistakes -- we're still fixing those mistakes. We got a long way to go. But I think we have a good chance of making it.