I rest my case.
If you rest your case here then I'm sorry, case dismissed due to insufficient evidence.
You need to be purposeful, otherwise your message isn't as strong as it could be.
I don't think we're actually poles apart on this, but your phrasing seems to suggest design is only effective and legitimate if it is born of conscious logical meaning.
Consider this: man goes with a logo purely because he likes the look of it. He never consciously breaks it down like this but he likes the composition, colour and form.
Man goes back to his work as a photographer. Without thinking about it consciously, he photographs as he does based on his tastes for composition, colour and form.
Does the logo therefore not represent his work and business? And do so without setting down a conscious logic to give it meaning?
As a professional tasked with designing logos for businesses you know nothing about, it makes sense to start with some sort of logical meaning; but for an individual making their own logo most probably just to add a little professionalism to their business it doesn't need to be conscious.