I think we have similar hopes for quality discussion in forums. And I certainly agree that a thoughtful response giving reasons why it's not as simple as "why

I think we have similar hopes for quality discussion in forums. And I certainly agree that a thoughtful response giving reasons why it's not as simple as "why can't we just" is more useful - assuming anyone feels inclined to write that response. The problem I see is the following. The person who wrote the "why can't we just" has done next to no thinking of his own as to why the situation might be more complicated than his first thought suggests, but it goes beyond that. Someone who writes "why don't we just" is sending the signal that they're emotionally committed to the position that the solution _should_ be simple. If I take a deep breath and write a long, careful reply in response to the short, lazy "why don't we just" post, I'm not only taking on all the burden of thinking about the topic at hand, but there's every risk this will just be thrown back in my face by the poster who wants a shortcut to a simple answer. A "why don't we just" post has a poor chance of leading to a good discussion, and I think there will be overall more beneficial discussion on a forum if they are discouraged. Some people are intellectually lazy. I think this is because it's easier to feel smarter when you think less. If there's a solution that seems obvious to Mr. A and he assumes everyone who missed it is a bozo, then Mr. A feels like a smart guy. If someone else comes along and starts telling Mr. A that actually it's not so simple, and there are reasons why the "obvious" solution isn't actually a full applicable solution, then Mr. A has to think harder, only to feel less smart as a result. A lot of people resist that. I don't know the full solution of how to inspire such people to start thinking more, but I think some push-back some of the time is part of the answer. A bit like when people come to stack overflow and ask for their homework to be done for them: it's good if they're prodded to try _something_ for themselves. Being "nice" and just doing their homework for them wouldn't be optimal. Yes, "the world is complex" might not be ideal phrasing if you think it implies someone needs to grasp the entirety of that complexity. But I'm sure the poster who wrote that only meant to encourage Mr "why don't we just" to _start_ considering the complexity of the world.