It is the responsibility of the banks themselves not to increase the money supply even though they can

Like counterfeiting, increasing the money supply (by legal means) is a way to profit through the direct extraction of wealth from others. It does not provide something objectively valuable as all other forms of legal trade do. With the exception of banking all free market activities add to the wealth of the nation or society within which they are located. Banking (though legal) is a drain on the community.