Theme: Blaming Others and Trying to Find a Scapegoat Can Lead to Violence.
Evidence 1: On page 674, Steve said " Seems that the general impression holds that maybe one family isn't what we think." toward Goodman because his car turned on by itself.
Evidence 2: On page 678 Tommy had said "It's the monster. It's the monster." when the figure was walking up to them, and so Charlie shot it.
Evidence 3: On page 683, everyone's lights for their house went on and off, so they started blaming each other which led to violence.
The theme of "Monsters Are Due on Maple Street" is blaming others and trying to find a scapegoat can lead to violence. One piece of evidence that supports this theme is when Steve said "Seems that the general impression holds that maybe one family isn't what we think." He said that because he thought that Goodman was the monster since his car started up by itself. Since they were afriad of Goodman, they kept an eye on him. Secondly, when a dark figure was walking up to them, Tommy said "It's the monster. It's the monster." So Don Martin went to get his shotgun to protect them. When the figure got closer, Charlie took the gun and shot it. The whole town went to see who it was. When they got near it, they saw that it was Pete Van Horn. Everyone started to blame Charlie and they even threw rocks at his house. One of the rocks broke a window and part of the class had cut Charlie. Lastly, at the end, everyone lights for their house went on and off. Everyone got scared and started blaming each other. They even got violent because they were worried. In the end they killed everyone, if they worked together instead of blaming each other, they would've found out that the aliens were doing everything.