Re: "a gentle word will probably achieve more than the f-bomb"
I can relate to that.
Everyone makes mistakes now and then, but there are a lot of people out there who do sloppy work and simply cannot be bothered to check it properly and do not care what problems it causes for others.
I have worked with such people, and I cannot think of any instances were asking nicely has helped at all, I can, however, think of several instances where losing my temper and delivering an f-bomb did make a difference.