Too incompetent by what definition? That presupposes that there's some level of competency that's mandated at-large. If you're dumb enough to believe drinking bleach will cure cancer, especially with the internet at your fingertips, you kinda deserve whatever consequences come from that. It's not yours, mine, or the government's job to prevent that.
Taken to its logical conclusion, this kind of thinking builds laws and societies catering to the lowest common denominator which is a preposterous suggestion. You hit the nail on the head in the sentence right before—there is no perfect system. But one that caters to the lowest possible subset of mental cognition is definitely not a step in the right direction.
The people do not need to be told what to believe.