Concerning Are 'tree waterfalls' possible?
Some time after answering the question myself, I found LazyReader's answer had been deleted. However, I felt the answer had intrinsic merit, so I edited the answer to address the issues brought up in comments and voted to reopen. I was delighted to see it reopened.
One hour later, Nathaniel edited his answer to (IMO) cherry pick information he liked about LazyReader's answer, extend it a bit, and repost.1 This started a bit of a spat between us because I'm not a fan of cherry-picking anybody's answers without permission. Nathaniel challenged me to cite policies.
From "The Editing Process" we read:
All contributions are licensed under Creative Commons, and this site is collaboratively edited, like Wikipedia. If you see something that needs improvement, click edit!
And from "Expected Behavior" we read:
Provide better answers of your own. Last but not least, edit and improve the existing questions and answers! By doing these things, you are helping keep Stack Exchange a great place to share knowledge of our craft.
But, although the disfavor of cherry-picking has been acknowledged in comments for years, there isn't a specific policy per se that I can find that specifically admonishes against it.
Question: Is it permissible on WorldBuilding.SE for one user to take any part of another user's answer and use it to formulate a new answer or to edit an existing answer with it, without the original respondent's permission? If so, to what extent is cherry-picking allowed?
1 While Nathaniel inadvertently followed some of the Help Center's "How to reference material written by others" section, I do not believe Nathaniel's edit logically extends his own original answer in that the portion of LazyReader's answer he cherry-picked could be equally applied to everyone's answers for the same purpose. In other words, I believe he simply wanted to take what was the obvious Earth-biology example and include it in his own answer. I'm tempted to say that this isn't intrinsically part of my question here on meta, except that it represents IMO the worst-case example of someone cherry picking someone else's answer.