John McIntyre has posted some worthwhile thoughts on grammar-and-usage superstitions. The whole post is worth reading, but my favorite part is why these superstitions should not be passed on:
In the first place, they don’t teach you in school how to dress or what booze to drink, but they are supposed to teach you how to write. And if they are wasting their time and yours with a load of codswallop, they are inhibiting your ability to use the language with facility and grace.

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