"Someone who can't spell doesn't have the most fundamental prerequisite to intelligence, or doesn't care about being intelligent."
Intelligence equates with good spelling, eh? So, you're saying all the way up to the point in human history, even beyond petroglyphs, when we began to form a "legitimate" alphabet in order to spell...human beings were void of intelligence and didn't "care about being intelligent"? ...How do you figure???
What is your estimation of oral language, which obviously came before written? I suppose its creation just "happened," with no rhyme or reason...no developed thought patterns, intellect, or designated meaning.
Can't help but think about Neil Armstrong's famous quote: "That's one small step for man, one giant leap for mankind." If good spelling is the final destination to the world of wisdom, how on Earth were we intelligent enough to map out, or even survive, the journey?