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Veteran librarian here! Oh, yes, there are definitely many stupid questions. We were just trained to pretend they were all legit and meaningful.
A CX PM attended one of my teams inspect and adapt sessions where we were showing a machine learning model to help determine based on weather patterns, water levels and usage information to identify the most likely places leakages on the clean water network may hit during adverse weather events. 
He asked how we can ensure that our machine learning model wouldn't learn too much and try to take over the rest of the platform. 
Trying to explain to someone that a machine can only learn from the data it has access to and all that it could do was predict outcomes based on data when that person thinks we could create a fucking terminator was terrifying, hillarious and hugely frustrating. 
So yes I agree, this man asking how we could ensure we didn't accidently start skynet was a stupid question. >

This is gold >

Well of course there are. The reason educators say this is because if students avoid asking a question because they fear they will be negatively judged for doing so, they will end up just not understanding the material, which helps neither the student nor the teacher. >

This guy gets it. Since asking stupid questions is the initial antidote to ignorance and stupidity, you encourage people to ask anything, especially the not-to-bright (yet) people.
It's a useful fiction. >

here's a stupid question:
"How much more stupid would it have been if I had not asked this question?" >

That question is not stupid. It perfectly encompasses the fallacy in OPs opinion >

ok, if the question is not stupid then what's your answer to it? >

Sometimes complex questions don't have a simple answer >

When I was in miidle school I was thrown out of my English class for laughing at a question posed by another student. We were discussing Wilfred Owen' poem "Dulce et decorum est", and in particular the line "as in a green sea I saw him drowning". This referred to the chlorine gas used in WWI, but the other student asked if Wilfred was wearing green tinted sunglasses. The English teacher was absolutely furious with me. I'm not quite sure what I learned that day.