So, with respect, Morrus, I already noted that this is largely an emotional issue. Of course, just presenting someone with evidence does nothing to overcome emotional resistance. "The nail didn't move when I used a screwdriver on it," does not mean the nail cannot be moved.
And, "they don't change their mind when presented with contrary evidence" is not the same as, "cannot or will not ever change their mind".
Is it really hard to change some people's minds? Yes. But accepting it as impossible is self-fulfilling prophecy.