We're ruled by politicians, bankers and corporations who lie, cheat, bribe, tax-dodge, and break the law with impunity. Why shouldn't the rest of us?
But most American believe it wrong and there is a mixup between what is wrong and what is legal. Keeping it that way is a very profitable thing for financial institutions.
GP post brought banks as an example of corruption. And many would agree. However it can still be legal. At that level, those player are basically writing their own laws and regulations.
The way to eliminate corruption is to overthrow those who are corrupt.
Also, violence does not necessarily lead to less injustice. The French Revolution (and countless others) provide rich counterexamples.