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.
Primary example: society is continually engineered to eliminate poverty, and yet poverty persists.