I don't think it's the lack of the ability to reason. The question is by definition a trick question. It's meant to trip you up, like ' "Could God make a burrito so hot that even he couldn't touch it?" Or "what do cows drink?" or "a plane crashes and 89 people died. Where were the survivors buried?"

I've seen plenty of smart people trip up or get these wrong simply because it's a random question, there's no stakes, and so there's no need to think too deeply about it. If you pause and say "are you sure?" I'm sure most of that 70% would be like "ohhh" and facepalm.