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I feel this is a bit too, err, hostile. I'd suggest more along the lines of "I'm hesitant to answer as this looks like a homework question. Perhaps you could provide more motivation for your question, or explain the background?"
Asking someone to "identify themselves" seems to have the wrong tone.
The original question of whether or not requiring identity before answering violates MO etiquette remains relevant.
I'd say there's nothing wrong with setting a personal rule not to answer any questions asked by anonymous users. If this becomes a trend, this is a natural incentive (as opposed to an enforced rule, as in your previous thread) for users to use their real names. I'm not sure a question's comment thread is to place to pursue this cause, but you could certainly publicize your point of view in your bio.
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