Rewriting questions by editing

Question

See, for example, this question where the content of the question is essentially entirely rewritten by edits, when there were already several answers (including an accepted one).

Should edits like this be rolled back? Should they be left alone? Should they be flagged?

Answer 1

If the user wants to ask a new question, they should post a new question [1, 2]. Roll it back without mercy. $\scriptscriptstyle{</\text{grinch}>}$