People being human beings and often driven by emotions rather than rational decisions, even if only a proportionally small group of depositors lose their confid

People being human beings and often driven by emotions rather than rational decisions, even if only a proportionally small group of depositors lose their confidence in banks and chose to withdraw their savings, such an event could quickly snowball into a complete panic where the one-off 10% levy is the least of people's problems as if people expect that the banking system will collapse (and once again, rational decisions play no part here, much of the banking system is built on trust) they would desperately try to get hold of their savings even after the levy has been imposed.