In the story, The Monsters Are Due On Maple Street, the people of maple street are perfectly normal until aliens come and decide that they should test people and shut down their electronics and just their technology in general. After that, everything goes down, neighbors turn on each other and begin to almost kill each other. The lesson of this episode/teleplay is that there is no monsters, only the ways people act, there actions and prejudice.
Everything is perfect until the radios, phones and cars stop working and Steve, Charlie and Don Martin are worried and calm everyone down
There are no such things as monsters, only the thoughts, acts and prejudice of people
Charlie accidentally kills Pete Van Horn, because he thinks that its the "monster" Steve and everyone else begins to get suspicious of him