There's a bit of Dunning-Kruger to this too: the stupidest of questions will come from people who are absolutely convinced that in their case The question is warranted. It's just practically never.
When one in a thousand misguided-sounding questions is legitimate, the only sensible thing to do is to assume all questions that sound misguided are. Then it's up to the person asking to be clear in why it's not. (Not to mention that clarifying that also tends to reveal other meaningful constraints on the answer.)