On a very similar note, a line in Mythbusters' opening that always amused me, "We're professionals, and that keeps us safe." No, it doesn't, it only means that

On a very similar note, a line in Mythbusters' opening that always amused me, "We're professionals, and that keeps us safe." No, it doesn't, it only means that someone is willing to pay you to do it. I think the use of "unsafe" is exactly what is a common case. That is declaring, "I know what I am doing," and that for most people do do this may be a bad idea.