Maybe in certain situations. But as an engineer on more than a couple of occasions I have pushed back on safety concerns and I was adamant that certain things be fixed for the company's reputation and for safety reasons. I did go over my manager's head because he wouldn't listen. Should I have been fired? Ultimately on one occasion I went up 4 layers of org chart to a VP who finally had the sense to listen because my concern was going to cost the company a lot to fix. I didn't get fired and actually got a bonus and raise that year because I stood my ground. However I never threatened to resign, they would have had to fire me to get me out of there :)