This was (is) the electoral college map, after the 2016 US presidential election.
What would have happened if just 1 out of every 100 voters had shifted from Trump to Clinton? This—according to 538:
In the study of dynamical systems, a state is a proper (stable) equilibrium if it does not change too much under small perturbations. Stability is usually considered a good property. Specifically when we are dealing with a social system, we value resilience. And here we are in front of a democratic design that would have given a completely different result if only 1% of voters had changed minds.
It was the same with Brexit. When for whatever the reasons, our societies and our choices are beginning so polarised, it seems more and more, that we are throwing dice or playing Russian roulette instead of making informed, calculated decisions. Does it make sense?