I agree with protecting it. However, I am not a layman and I don't think the question is neither vague or broad. He basically asked:
Is $A \Rightarrow B$ correct?
and I answered:
No, check this counterexample. And here is some more information if
you are interested.
Given that we are economists the term person A loses and person A gains is fairly common and I guess most economists would automatically add "in terms of utilities, given some reference point" (like I did). If that was not clear someone should have asked and improved the question.
As this question unfortunately attracted a lot of attention from the outside, we had many answers and comments like:
- I have an example, so it is always correct. QED.
- You have not mentioned that it IS possible that B could follow from A.
- You pretend as if capitalism is a good thing but it is bad!
I don't think this has anything to do with the quality of the question, I think it is a general problem with economic questions: everyone has an opinion about it and if they think they understand the question they will answer. We just have to learn to deal with them (i.e. downvoting, protecting these questions and making them as precise as possible).
I won't argue that it is not a great question and I would not mind not allowing these kind of simple questions here, but that is a different matter.
Btw I think your answer is also inaccurate (see my comment) ;-)