The bankers said they opposed it. Pretending they didn't want it to pass. Because public opinion usually goes against what the bankers say. The congress thought by passing it they were opposing the bankers agenda but the bankers public statements were not how they actually felt. They manipulated them.

Also important to note is that the bankers themselves didn’t take the bill to congress. It wasn’t “we’re the banks, pass this bill for us.” It was a politician friend of the banks who pushed the bill and helped make it look like it wasn’t what the banks wanted, even though the banks secretly wanted it to happen.