I agree. Stability of a system is not so much about whether there is some mechanism or force that wants to push it away from equilibrium (because there probabl

I agree. Stability of a system is not so much about whether there is some mechanism or force that wants to push it away from equilibrium (because there probably is some such perturber outside of a perfectly controlled environment), but stability is more about whether there exists a stabilizing mechanism to bring the system back toward equilibrium after it starts to deviate.