It's pretty simple, something like this:
"I stupidly paid and/or pre-ordered this garbage product for £50"
"I don't consider myself a complete moron"
"Therefore the product must be good"
"and anybody saying otherwise is effectively calling me a moron"
"by defending the game I am also defending myself"
It really is something, and it seems to be becoming worse, more tribal. People feel far too validated their game of choice doing well and vilify people talking it down. Far from the earliest example but I can never shake that No Man's Sky release and people trying to argue black was white and the sky is green as Murray's web of lies collapsed and doubled down when presented with videos of Sean Murray talking about multiplayer, it's insane.
Can't we all just get along?