It’s not that human behaviour is inflexible - indeed, it’s the opposite, humans are so flexible that they do things that are hard to predict. Given a large enough population and enough time certain negative behaviours will inevitably happen. With modern societies, this becomes a near certainty. If you stretch it to the absolute limit, then all things will happen, good and bad.
In your view, every society is a failure in its essence, because humans are in their essence incapable of forming any society that is not a failure.
Still, you’re trying to put words in my mouth, twisting what I’m saying into an absolute statement that I have not made, so you can argue against that. I do not appreciate this. You are being offensive.
Ignoring the capacity for people to do bad things is the height of negligent ignorance. That isn’t to say that everyone does bad things and has bad intent, just that everyone has the capacity to, and if you have enough people and allow enough time bad actors will surface. Any society of any significant size that purports to last long enough must acknowledge and accommodate this fact. This is the foundation of criminal law, which is present in every society.
That doesn’t mean that every society is a failure, just that there is room for improvement. I’m simply saying that the models currently used to form a society aren’t accurate enough and don’t adequately account for human behaviour. We need to adapt our models and make them better, not rely on philosophy from 100+ years ago.