Nobody asks the engineer to see the entire picture. (Very few, senior, engineers see the entire picture - to the shock of many newbies. But that's for another discussion). The problem is when the engineer DOES see the problem and doesn't question the project, and stays on, and doesn't figure out a way to get it questioned, and in the end doesn't report anything. THAT is an ethics problem. And yes, in some companies it will cost you your job. That's where the other jobs come in - because there ARE other jobs.