The founding fathers knew that the system wasn't perfect and would need to be modified as things changed and flaws were discovered. Making it work by "doing it right this time" was the point. That's not a sign of a bad system, it's a good thing!

Of course, nothing about government itself prevents adults from engaging in consensual transactions, and only a tiny percentage of laws do. Sometimes those laws are stupid and sometimes they are good to have. The original plan (and I still think it was a good one) was that we would have the ability to remove the bad laws and add good ones as needed. That process mostly even works, but with corruption and bribery in our government going unchecked it usually just works for a small few and the rest of us get shafted as a result.