"Joan, CCSVI and the vascular connection to MS will be tough for neurologists to accept. They will have cognitive dissonance."
Some practical examples-
I know smoking is bad for me, but I'm addicted and need this cigarette.
The person I voted for is doing some pretty terrible stuff, but I picked them, so I have to keep supporting them.
I know this burger and fries aren't great for my health, but they are delicious, so the hell with it.
Yeah, that player may have beaten up his wife, but my team is having a great season, so I'll cheer for him.
The brain needs one of these ideas to win over the other, since both realities co-existing is painful.