Is the below sentence correct? I feel be (is) verb is missing.
Why this moralising conclusion?
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There is a common informal saying in spoken English with the same structure:
Why the long face?
Which is something you would ask someone who doesn't seem to feel so well. This is a way to say "What's the matter?" "What's wrong?". This funny discussion on the BBC website should enlighten you about that one: BBC.co.uk.
In a spoken discussion with friends or acquaintances, you could use such a structure. You could also say:
What's with this moralising conclusion?
In a more formal discussion, you'd prefer using a full appropriate question:
Why would you end on this moralising conclusion?
Or something along these lines.