So are unions and welfare and all sorts of things. A society that mixes and picks techniques that work the best is way better than the society that goes "well, capitalism has issues, throw it all out!" Marx was totally wrong about communism because people adapt to their situation. We didn't run out of oil by now because people found new sources and used less. We haven't run out of copper because we invented fiber-based communication. We are never stable as a society if you look at where we stand and extrapolate that trend into the future. What makes us stable is constant change and tweaking of ourselves. Our ability to deal with instability is what makes us stable, not the fact that our society is made to be stable.It's a prop to keep capitalism from running off the rails once society no longer carries the structures that made it a stable social arrangement.