All of the accused at Nuremberg were found to be sane. They were a dangerous lot.
https://en.wikipedia.org/wiki/Nuremberg_trials
And that's a good example of sane (in the medical/psychiatric meaning of the word) people doing crazy stuff.
How does this prove that sane people are more dangerous then crazy people?
What are we even calling "crazy" here?
Are we talking about the medical kind of "crazy"? Like people suffering from psychosis or alike?
Or are we talking about the beliefs kind of "crazy"? Like fundamentalists blowing up clinics that perform abortions or flying airplanes into buildings?
If "sane" simply means "healthy", then I'ld say that it's kind of a given that "sane" people are more dangerous.
For the simple reason that the chaotic mind of a schizofrenic will (in most cases) not be able to plan for things like the nazi holocaust, the 9/11 attacks or the clinic bombing by McVeigh.
Then again, that's not how interpreted the post I was replying to.
So to conclude, if by "crazy" is meant "psychiatric patients" then I agree that "sane" people are more dangerous (for obvious reasons).
If we aren't talking about the medical version of "crazy", then we're going to have to define the term "crazy".
In a non-medical context, I most certainly would call Hitler, Goebels, Rommel, Bin Laden, McVeigh, the Phelps, etc... batpoo-crazy!