Is more useful than a closed one.
A closed mind is a one track mind, a mind with tunnel vision a mind likely to miss things worth noticing.
One thing worth noticing is that not everyone sees things the way that you do and no amount of encouraging, influencing and arguing will change that.
It’s actually okay to think differently and not agree after all why should 2 people with different sets of genetics and life experiences be expected to think the same.
I think a mistake often made about being open minded is that you to agree with the other person. In reality it’s merely acknowledgment that it’s okay for people to not see things the same way that you do.
It’s not always black and white or a case of right and wrong.