Your premise is way off. Weapons are not allowed in banks.
So you’re trying to make a comparison to 2 very different things
There is no law in Georgia prohibiting carrying firearms in a bank. An individual bank may have policies against it, but they would have to provide prior notice and can only ask the person to leave. This is all spelled out in the Official Code of Georgia Annotated § 16-11-127.
So my premise is fine. And yet still, neither of us have all the facts of this particular case. It needs to go to a trial so the facts can be established and the law can be applied. If the state can’t prove beyond a reasonable doubt that these guys did something illegal, they should absolutely go free. If they did, in fact, do something illegal and the state can prove it, they should face punishment.