Society has been re-engineered any number of times, to good and bad effect. If you think that how it is where you are right now is how it is, has been, and always will be everywhere, you're wrong. Society is made of people, including visionaries and others who are captivated by their visions and have the ability to implement them. Contemplating human society is not the same as contemplating the stars.
Society isn't engineered, it evolves. If you try to engineer society it'll never come out quite the same way you intended; there are always unintended consequences because people are so messy and complicated.
Primary example: society is continually engineered to eliminate poverty, and yet poverty persists.
Society evolves. Society is often engineered. The attempts often turn out badly, or well. Many societies are engineered to reduce poverty, and many societies have.
