Repressing volatility does not fix the underlying cause of the volatility.
If one or some exchanges decide to introduce circuit breakers, there no doubt would be other exchanges that would market themselves as insitutions that do not use them.
Exaggerating volatility won't help things either.
There is a market for markets, and most people will choose to use exchanges that don't externalize market friction caused by fraudulent events.
You have fun with the hackers and their scripted flash crashes over there at MtAnarchist. The rest of us will be sane and use rational markets.