The B I G name for that is confirmation bias. People see what they want to see, and disregard the inconvenient facts. That is why one LDS poster provided me with so many belly laughs.There were so many flaws in what he posted (and I tried to point them out) that the only healthy response was ridicule of the contents of his posts and avoid ridiculing the poster himself.I agree that when someone is in that mindset, they will usually see things the way they want to see them. And jump at anything that even remotely looks like it could be proof.
So egregious were his errors that one "sane thinking LDS poster" ceased being in the peanut gallery cheering him on.