Laws don't tell us what is right, what is right tells us what the laws should be. To interpret the constitution you have to put it in context, and understand what the primary fears the founders had, and why they chose to do things the way they did. It's impossible for anybody to predict the future, and the founding fathers wouldn't have had any better luck than anybody else. They knew the problems they were trying to avoid, and they did the best they could to prevent them via the law. The only realistic way to interpret the constitution is to use some common sense and ask yourself if they had anticipated this scenario, and if they could have how would they have viewed it and why.
You also have to realize that while these men were very intelligent for their time and age they were still brimming with misogyny and racism. Many of the rights they wanted for themselves they might not have seen as something that should have been granted to women, blacks, native Americans, gays, muslims, Atheists...... In the modern age we recognize that was wrong.