> On the other hand, why care what the American founding fathers thought?
Because they had direct experience with tyranny and exploitation, and documented their response to that in the US founding documents. We care because if you don't learn from history, you're doomed to repeat it. Which is pretty much what's happening right now.
At the same time, it's necessary for societies to grow and evolve. Looking back 250 years and saying "This isn't how THEY would have done it" is not always the correct perspective.
Anyway, you don't have to look back to the founding fathers. Go back to 1930's Germany and you can see all the parallels you want, much closer to today's situation and in a much more modern and relevant context.