Let’s say that you and I agree that we’ll take turns making lunch. We both have to eat whatever the other person cooks.
A couple of decades later, I start to suffer from dementia. I start cooking meals like jello dog kibble flambe. You have to eat it all. I won’t allow the rules to be changed.
The agreement was reasonable. We were both reasonable at the time the agreement was made. Saying that we deserve dog food, because we had a plan to take turns making lunch, is not a reasonable view of the situation. Sure, in retrospect, maybe it should have been clear that an exit clause might be necessary at some point. But it’s not like there was any malicious intent by anyone.
In our real world case, the Framers didn’t foresee the political parties, they didn’t foresee the usurpation of the electoral college and the Senate vote by populists, and they didn’t foresee the rise of the Internet, the Greater Internet Fuckwad Theory, and the Culture Wars.
But we do, at any point of time of our choosing, have an exit clause. All laws can be changed. The Constitution can be changed. Party primary systems can be changed.
At any point in time, we can all accept that we’re all just the greater Internet fuckwads and change the rules to diminish our own influence. We can always choose to replace our current systems of voting with better ones that place more emphasis on substance and moderation.