The misconception concerning omniscience stems from elitism, most frequently. Or put another way, people think they know everything because they count themselves amongst a "select few". It's a convenient thing, really, elitism. It allows people who know nothing or almost nothing about a given subject to feel smugly superior to others even when they're being looked down upon by everybody else for their deliberate ignorance.
The surest sign of elitist ignorance is when somebody claims they are right and refuses to discuss it. Other marks of the trait are relying on personal attacks in debates, tossing about labels with wild abandon, declaring any source of contradictory information presented as unreliable, and just generally acting like a jerk about something to avoid having to admit a lack of knowledge.
Some even try to mask their lack of actual knowledge with long-winded diatribes of poorly used statistics, but don't be fooled. I find that, the angrier a person gets at your continued opposition to their opinion, the less they actually know about the subject.
Sky Render - Sanity is for the weak.
