They certainly voted with their wallets for a plane that doesn't require additional training. But they sure as hell did not vote with their wallets for a plane that does that on expense of crashing. And, to reiterate my point, I think that managers who pushed for trade-offs between different objectives did not push for this particular trade-off either.

Well, that's the law of unintended consequences. Customers wanted so not pay for retraining, Boeing wanted to get to the market faster and not wait for re-certification, managers wanted a physical problem fixed in software - and in the end the envelope got pushed too far.

I am sure the company operating the Titanic didn't exactly strive to have a shipwreck either.

This is true, but it is a statement about causality and the thread was about responsibility. Those are two different things. The fact that your actions lead to a certain outcome does not automatically mean that you're morally responsible for this outcome (that's the fallacy that leads to victim blaming, among other things).

It is always engineer's responsibility to clearly explain the trade-offs to the managers. Only a manager who's making the decision with accurate information can be responsible for it.