People aren't smart enough and/or don't have enough time and/or are too susceptible to emotional or psychological manipulation to be capable of sorting out truth and fiction, let alone correct conclusions from incorrect conclusions supported by misleading truths. The scale and effectiveness of misinformation makes it completely untenable.

Even if it were effective, we've been encouraging the "teaching [of] critical thinking" for all the time I've been alive and pretty much nothing has changed (at least, not in the direction of increased critical thinking!). At this point, a call to teach critical thinking is a call of no action.