Why were people writing Fetterman off so bluntly near the end?

[Dani Rose]

Confirmation bias. Whether it was out of fear of a red wave or a genuine desire to see him lose, people worked themselves into a frenzy and convinced themselves that the only possible thing that could happen was Fetterman going down in flames, and they took every single mote given to them by right-wing grift polls as irrefutable evidence that their fears or beliefs were right, completely ignoring the much more reputable polling showing Fetterman winning pretty comfortably.