[nucleardog]

It would be funny if so many didn't already wear their ignorance as a badge of pride.

Imagine an article on vaccinations--many who would be posting exactly the sort of nonsense you'd be hoping to prevent would wear their "understood 0% of the facts in the article" as a badge of pride, and others who agreed with them would interpret it as such.

[jfengel]

At least 0% would require more knowledge than guessing. You might even accidentally educate a few anti-vaxxers, who would be forced to learn what they were disagreeing with. (Yes, I know it still wouldn't help.)