some very good comments.
Why don't people want to admit they were wrong, even when it seems obvious to everyone else? Ego. Nobody likes to be proven wrong. But, if we can get over that pride thing, we should WANT to be proven wrong! It makes things better for us.
Because, it's bad to be wrong. Therefore, if you're wrong, the best thing is to *stop being wrong*. And the way to stop being wrong is to change your mind.
Also, there are lots of side benefits to changing from a wrong view to a correct view. For one thing, you're suddenly more right! And, for another, now being right lets you see things in a whole new way.
If you think that 1+1 equals 3, the world isn't going to make a whole lot of sense to you. You'll think your paycheck doesn't add up, and everyone's giving you the wrong change. You'll think the IRS is ripping you off, and mathematics is just arbitrary, since everyone just seems to be totaling things a different way. You'll be suspicious of everyone, and life is going to be pretty difficult.
But, when you see that 1+1=2, suddenly, everything comes into focus! You'll see the world works logically, after all. You now predict what people will do, and see that everything really does add up. Your life is better -- a lot better.