Most people in life don't get the benefit of sample size, you don't get 10 chances of nailing that important neeting or interview, some players only get one game to do their impression.
This was Palmer's big chance, he finally was healthy with a strong team with a real chance at winning it all. He was coming up a MVP candidate season with the best group of receivers in the league. He delivered a shaky performance against GB that proved enough to win so he got a second chance to deliver a strong performance to send his team to the SB and he failed, he chocked badly. Maybe he'll get another chance to redeem himself and if he does then everything will be forgiven but if not he will remain a chocker.