Because you will never believe diddly about those whom you like if it's negative and always believe negative crap about those you don't.
You will discount inconvenient truth anti YOUR guy but absolutely believe LIES SMEARS about the "other".
That's why you're all called "FAITHFUL"
You need no evidence or proof or truth to support your chosen hero
And no evidence proof or truth will convince you that your guy' opponent is any good at all.
Nothing will change. It will remain as it always is. Believe what ya want and disbelieve what ya want. Period. End of story.
SIGH.