by 
-O-uknow
ANSWERS: 2
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Because "shouldn't you" = "you should," becoming a command in the process.
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Wide Awake Phoenix is quite right about "shouldn't you" being at least like a command, but both can be a provocation. Through one just as much as the other you could be imposing your moral/ethical/logical/etc. values and ideas. "Shouldn't you do your homework before you arrive at school?" can be just as upsetting as "Should you be dancing on that foot so soon after surgery?" Of course, to quote the BeeGees, you should be dancing...but i digress. The clear way of avoiding the imposition with "should you" is if you're asking if you should do one thing or another thing. Another way to avoid more or less pontificating is to avoid both phrases entirely (as i should try to do myself).
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