If they have not internalized the consequences of the risks they're asking their subordinates to take, they'll weigh what look like vague misgivings about "mumble, should be better, dangerous, blah blah" against the better understood risk of their bonus disappearing if the product doesn't ship on time.

Even if you choose to sacrifice yourself, your reputation, and your future prospects--again, if almost no employer in your industry would value what you call professionalism over short-term profits--someone else will ship the code you wouldn't.

That isn't a defense of anything; it's just a fact. Taboos (e.g. against bad code) don't work if they're not shared by the majority.