One answer to the OPs question. Where are all the normal people?
Dead. They lived in Moonhaven and were all killed. There were also some who were fishermen down by the river. Also dead. The Intellect Devourers killed them. There were some at the tollhouse and at Waukeens Rest. Also dead. Killed by Drow or Gnolls. The only surviving, somewhat normal people are those in the Druids Grove. That's all you get in EA.
That said, it actually makes sense, you know. A bunch of crazy people were infected by Ghaik. Your party is filled with special people who were infected for a special reason. Some crazy stuff is going on with a usurping new Goddess called the Absolute. She is having her minions purge normal people from the land. She is killing off the followers of other gods. Selunes people loved in Moonhaven. She wants the Grove destroyed to kill off Silvanus' followers. There was a person by the river, now dead, who served Umberlee, cause he had a book about her. Even the goblins who serve Moglobiat are being killed off. Over and over again, servants of the other gods are found slaughtered by a new Goddess who wants supremacy.
So, naturally, only the special people, the heroes, are surviving.
