It's more that we, as individuals, have always been stupid, we've just relied on relatively stable supporting consensus and context much, much more than we acknowledge. Mess with that, and we'll appear much stupider, but we're all just doing the same thing as individuals, garbage in, garbage out.
The whole framing of people as individuals with absolute agency may need to go when you can alter the external consensus at this scale. We're much more connected to each other and the world around us than we like to think.