The guy involved has left JPM, most of his team will have left too, they will have bonus payments clawed back, they will be banned from the industry, and are being charged criminally. Afaik, two people from this team are currently in prison.

The shareholders are part of the bad actor, because the shareholders control the board, and it's the board's job to police the company, and to make sure that it's actually ran well, and isn't just a free-for-all frat party.

If the shareholders cared to avoid these sorts of judgements, they'd require that the firm operate more conservatively.