if no one takes their money out the banks will survive longer.
Well, that's sort of the thing. People
will rush to the banks if the possibility of them collapsing is hinted at. Besides, you're absolutely right when you say that withdrawing all one's money is the worst thing to do for the
group, it's actually the only thing you can do if you're an
individual. That's what drives herd behavior in the first place.
If it's gonna happen, it's gonna happen, and you'd better make sure you withdraw
your money when it does!
Remember what happened last time?