That may well be so. But an open mind would give them the benefit of the
doubt anyway by listening first before dismissing them.
I have a limited resource--time. Why should I listen to something
that I've alread heard many times, when I know that the debate will be
waged in a narrow range, between the forty-yard lines?
A closed mind, on the other hand, can't be bothered. He can safely dismiss them in
advance because he's certain he's heard it all before and therefore he's
certain he knows what they will say before they open their mouths to say
it.
Not a closed mind. An experienced mind, with little time to spare for
known repetition.
Of course, if the world were filled with closed minds there would no
need for space exploration, would there?