A crafty being, (The Abominable No-Man) knows that fear is his best tool for creating division among the villagers and thereby killing the Good Idea. So he shifts from house to house, from tree to tree, whispering in the villagers' ears that the Good Idea is really a Bad Idea because it's a new idea. He reminds the villagers how good the Old Days were and suggests the Good Idea will cause disaster and destroy the village. The "No"-Man knows the villagers have nice memories of the Good Old Days and can be fearful of the future and of change.
The "No"-Man cries that the Good Idea is not good at all because it's not a sure thing and might even cost them something. He reminds the villagers of "those" people living in other nearby villages who might come to live in their village if the Good Idea happens. He whispers in their ears that things don't have to change as long as Good Ideas are destroyed.
It's not often that Costas shows his satirical side. Good for him.