> I expect those people to behave ethically at any given time.

A company is set up and incentivised to maximize a profit function, and that in turn incentivises to promote people which are not impeded by ethical considerations. The hierarchy furthermore ensures that people which would otherwise act ethical, don't, for fear of losing their job. This structure behaves ethical as long as you put ethics in the profit function.

Again, who is setting it up, who is "the hierarchy", who "puts ethics into a profit function". This is weasel language to not talk about the ethical responsibility of individual human beings.

These firms don't spawn into existence, they don't choose their own functions and if the people in charge don't think ethically why should anyone else? Ethics is not a game of musical chairs. The people in charge of that company can choose, right now, to orient it towards a direction that's ethical, if that's not possible they can choose to close it down or leave. That's up to any person at any point.

There's nobody to do ethics for you, there is no ethics fairy to magically imbue your company with ethics, and if you hope the politicians or "the law" does it but you can't, why do you think the politicians are going to be any better, they all have the same financial incentives. It is you or nobody else.