Some believe that there are people who just cannot see, even if they wanted to. But that is just not true, it's only a belief based on an inner superiority /interiority complex, which I will not go into right now.
Why wouldn't anyone (in their right mind) want to see? Plainly because continuing to see that which they already do, is – as they believe - to their advantage, which of course they don’t realize and reject the assumption.