It’s not enough for senior management to be removed. Malfeasance like this needs to have real life consequences.
And of course there are consequences to senior management.
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Since they cashed out a bit and got their bonuses, they can probably take a vacation for a month or two and then come back and get a promotion in some other part of the financial industry. After all, they have learned a multi-billion dollar lesson. Don't want to throw that away!