First, I will note that I'm not so sure "should" automatically means "should because you are morally obligated." There are other types of "should." I think people who post fanfic should attempt to use correct spelling, grammar, and paragraph breaks, but this does not mean I think they are under any moral obligation to do so.
But leaving that aside, in the vein of the troubling implications of language, the line in question doesn't actually say "should" in the first place; it says "how to" -- as in, giving someone information she might be able to use, whether she does or not. The "don't," on the other hand, is on its face a plain old imperative... except that in context, it's part of a long list of other don'ts that are moral obligations. So in context it actually appears to be saying that even though you've just acknowledged that "should be" isn't "is" -- thus having to call the police on people -- it's morally wrong to provide information that might reduce the bad guys' opportunities.
So basically, if the point the line's supposed to make is that saying people "should" protect themselves from attack is a subtly dangerous use of language, I think it might work better if it were itself more carefully phrased.
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First, I will note that I'm not so sure "should" automatically means "should because you are morally obligated." There are other types of "should." I think people who post fanfic should attempt to use correct spelling, grammar, and paragraph breaks, but this does not mean I think they are under any moral obligation to do so.
But leaving that aside, in the vein of the troubling implications of language, the line in question doesn't actually say "should" in the first place; it says "how to" -- as in, giving someone information she might be able to use, whether she does or not. The "don't," on the other hand, is on its face a plain old imperative... except that in context, it's part of a long list of other don'ts that are moral obligations. So in context it actually appears to be saying that even though you've just acknowledged that "should be" isn't "is" -- thus having to call the police on people -- it's morally wrong to provide information that might reduce the bad guys' opportunities.
So basically, if the point the line's supposed to make is that saying people "should" protect themselves from attack is a subtly dangerous use of language, I think it might work better if it were itself more carefully phrased.