Why does George have a hard time telling Keller and Kate what he came to tell them

George tries to be hostile, but he keeps getting disarmed by Keller's friendliness. Keller says he is sad to hear that Steve is still angry at him and that Steve never knew how to take the blame. He rattles off a list of incidents in which Steve tried to blame others to save face. George knows that this is true, and his anger is diffused. He decides to stay for dinner after all, and he comments that everything looks the same and everyone looks well.