Because the new "degrees of freedom" only affected a portion of the population.
That is kinda just-so Junior.
We are discussing a stability that stops becoming so. You are having your cake and eating too.
It seems to me that something is stable or something is unstable or finally something is on the edge of stability. If it is stable it is very unlikely to go anywhere save with great impetus. If it is unstable it is always changing. If it is on the edge of stability, (now I will kinda shift gears) it can spawn a change and remain stable, but it will be spawning lots of changes.