The focus on Boeing and elsewhere has revealed that for a substantial period of time the focus of management was essentially "gutting" the company; replacing highly skilled and expensive engineers and workers with cheaper workers elsewhere and generally removing any impediment to immediate profit - this including stretching to 737 spec to the point that it essentially "broke" rather than taking the cost hit of designing a new plane for a new era.
The thing is, when the paradigm the top puts out is "do whatever it take to make those numbers", you already have an implicitly unethical outlook but one with plausible deniability. The people who push that (whether management, hedge funds or board of directors) are careful not to overtly advocate anything illegal or immoral but it seems logical that when X underling who does Y ethical act is caught and punished, that underling will be replaced by another one who will face the same pressures and quite likely also engage in similar overtly unethical behavior.