Why should any sufficiently large government entity use a gigantic, multinational, for-profit bank for any purpose? The best interests of the people represented by a government body would seem to be served by keeping any profits and interest from government financial transactions in the area where these people live.
Public banking is a way to do just that. It can be done at a national, state, county, or local level. It has been working well for decades in Germany, India, China, Brazil, and North Dakota, among other places. Study up a bit and see if you think it is a good idea.
Good overview with FAQs:
An effort to nationalize the Federal Reserve Bank:
FB page: https://www.facebook.com/UnitedFrontAgainstAusterity
Interview video with transcript:
Brief history of banking in America:
Video of a 12 tear old girl explaining public banking:
“The Web of Debt” – A book you can read on subject:
A wonky econ geek piece:
Another argument for Public banks: