Actually, in the hearing Senator Warren tried to connect the fraudulent accounts to the stock price, which would have been a direct benefit for the bank:
> You squeezed your employees to the breaking point so they would cheat customers and you could drive up the value of your stock and put hundreds of millions of dollars in your own pocket. And when it all blew up, you kept your job, you kept your multimillion-dollar bonuses and you went on television to blame thousands of $12-an-hour employees.
http://www.nytimes.com/2016/09/23/business/wells-fargo-tests...
Wells Fargo pushed its employees so hard to open accounts because there was a benefit to doing so.
They created two million new accounts, letting them go to the market and tout demand for their banking services.
http://www.bloomberg.com/news/features/2016-08-18/how-lendin...
And there are also the companies that are convinced of fraud like Deutsche Bank, but it's the company that pays a huge fine when the executives who were overseeing all this go unscathed.
I have worked in a bank and I know a lot of people there have no clue what's going on, but the fact that it's true does not mean it's a valid excuse. If I kill a pedestrian with my car I can not claim it's not my fault because I had my eyes closed.