Charlie shouted, "It's...It's the kid. It's Tommy. He's the one!" He says this relatively far into the story, almost at the end of it. It was the beginning of the climax and happened at Charlie's house.
The Monsters are due on Maple Street
Tommy and his mother, Sally, along with the neighbors. The narrator said, "The crowd starts to converge around the mother, who grabs the child and starts to run with him." This happens in the middle of the climax, in the neighborhood.
The neighbors. The narrator narrates, "We move into a series of close-ups of various people as they shout, accuse, and scream." This is the end of the climax. It happens in and around the neighborhood.
The theme of The Monsters Are Due on Maple Street is that prejudice and suspicion and fear will destroy and devour. This is shown when Charlie blames a little kid being the "monster," and the sad part is that everyone believes him, even though he's just a child. They think that he is the "monster" because he was the only one who "knew" what would happen. Secondly, this is demonstrated when they start to chase the kid and his mother, even though neither of them have done anything wrong. They were innocent people who got caught up in the madness. Finally, this is demonstrated when all of the neighbors start to accuse each other of everything and they start to fight. The accusations rise and the voices get more tense, until finally, they come to blows, people shoot and throw thing at each other, and then who knows what happened after that. This is why the theme of The Monsters Are Due on Maple Street is that prejudice and suspicion and fear will destroy.