Phaneron

Question: Why did Grandpa join the angry mob? It would make much more sense if he was either on his family's side or simply remained completely neutral.

Answer: The family doesn't treat him very well, particularly Homer. He may have wanted some revenge on them. Grampa is also a little senile.

Phaneron

Question: When Carl told Cargill that people would discover the dome, how does that help them? How is that a problem for Cargill even if they hadn't taken Springfield off the map?

THE GAMER NEXT DOOR

Answer: Carl presumably believes anyone noticing an entire town being trapped inside a dome would do something to help them out of their predicament.

Phaneron