No. This is more similar to finding out that x virus causes y symptoms: that doesn't blame the sick folks for having the virus. It simply explains some stuff that is happening. When we better know what causes something, we are better prepared to do something about it. We have some fact-based reasoning to base our actions on.
It is, indeed, rational to be skeptical of information presented, especially when things are still developing, it is likely that we don't yet have all the facts, or during times of high stress or panic. It is rational to realize we all hold misinformation, and that some of the stuff we've learned is no longer true. But it takes some intelligence to realize this stuff. Furthermore, it takes a bit of energy to do so. Hence otherwise smart folks believing the fake stuff or not being able to pick out truth from the mess. Cognitive ability varies during the day, after all, and with situations (stress, being sleepy or chronic lack of sleep, hangovers, and various other things affect this stuff temporarily at least).
I'll add that some folks that appear "smart" aren't any smarter than the rest of us. Rather, we just meet them in a context that shines the best light on them, they are good at memorizing facts, or their knowledge base differs from our own.