The humans of the Garden of Eden had very near to perfect settings and they still gave it away for a piece of fruit. This indicates that it is due to human nature that utopias do not work the way they are meant to. There is no circumstance in which all humans will simultaneously be happy. The concept of everyone being different and unique means that people have different interests and different things make them happy. Something that one person enjoys, some other people will not enjoy. A system cannot be constructed which satisfies the wants and needs of all people at once.

It is also natural for humans to be curious, which is likely why those in the garden took the forbidden fruit is they were curious about it and about why it was forbidden. The same applies almost every where else that rules and restrictions are made. If it is it forbidden to enter a certain room, one is made curious as to why. They begin to wonder what is in it that is such a secret. Well, one quick look wouldn't hurt.... The only potential way to avoid rules being broken is to avoid making rules. This would not work either because of everyone's conflicting interests. People could not be happy with no rules, and not everyone can be happy with certain rules. These things make it impossible to create a society in which there is no unhapiness.

A good example of this concept can be found in the theory behind, and the trials of using communism as a political system.