when you compare it to the alternative people are proposing of doing nothing, that means thousands of layoffs and shuttered companies, and the American tax payer paying these people's salaries in the form of unemployment/welfare. this is a remarkably more expensive strain on the economy.
there is a reasonable argument to be made about the precedent it sets for banks in the future with regard to their risk tolerance; I don't have an answer to that.
anyone upset about this for any other reason just wants to be upset.