Does the destructors have a happy ending?

No, the Destructors does not have a happy ending. The story ends with the gang of teenagers destroying a beautiful old house, and one of the teenagers, Blackie, is killed in the process. The destruction of the house is a symbol of the destruction of innocence and the loss of a sense of community. The story also ends with a sense of foreboding, as the teenagers are left to face the consequences of their actions.