I think that those are two distinct problems: refusing to take a position (Crono) and refusing to reconsider an entrenched position (Vaniver). I wrote more about the latter, I think I've seen it happening more often to people around me. I especially find it staggering how little effort people spend on picking the opinion to defend vs. how much the expend on defending it.
It's not just about opinions that are worthwhile to have and defend for political reasons and tribe affiliation. My roommate for example will automatically pick the side against me in any argument just to be contrarian, even if it's just between us. Then, he will spend hours performing rationalization and confirmatory research until he has fully convinced himself of a position that he had no prior cause to favor (even I'm the dumbest person in the world, reversing my opinions can't be a truth-signal). Needless to say, after every exercise in this vein he congratulates himself on being extremely intelligent because he "fought well".
I feel like you could use this to make your roommate do research on things for you. Or are his standards of evidence really bad, in addition?
Inspired by the call to rationalist poetry fans and informed by years of writing satire.
When you ask for truth and are offered illusion,
When senses deceive you and reasoning lies
I'll show you the path through the murky confusion,
Just follow and close your eyes.
On matters of fact there's no fact of the matter,
All moral and virtue are fashion and fad,
So dress in the creed that will fit you and flatter
No one can argue with that.
Some puzzles unyielding and mysteries ancient
No formula ever could hope to describe.
How proudly the scientist seeks explanations
How clearly in vain she strives.
Make cases like fortifications of metal,
No rival assertion shall ever go past.
Be carefree in choosing the side of the battle
But guard it until your last.
The sages declared that to know is to suffer,
Where wisdom is gained there is innocence lost
And learning is danger – best leave it to others,
Avoid it at any cost.
Some fools declare war on their very own nature
Their weapons are evidence, reason and math.
Don't offer compassion to those wretched creatures,
They've chosen the other path.