well, 'face' is one thing, but when, for example, instructions for correctly operating a machine are so garbled as to be confusing and potentially dangerous, I think it is time to get some help!

I also seem to remember that in Japan it is thought impolite to 'order' anyone, so instructions are often phrased so that it looks like you have an option about "how to install the power supply", when actually it should say "do NOT attach red wire to switch, or you'll fry the whole thing, and maybe yourself!".

There are a lot of cultural eccentricities buried in those signs, not only in langauge use, but in what message is intended...concerns about "..drunkards, schitzofrenics .." convey attitudes, not just degree of language prowess.