It's true....I often say to my wife that most political ideologies would work if everyone was honest and participated.
But because people lie, take advantage, steal, use corruption etc there is none that works.
I suppose that's why capitalism has been the most successful flawed system. The corrupt at least develop, innovate and compete to get ahead which benefits most people. Problem is they work to dominate ther after.....its flawed but the best of a terrible lot