The Hen and the Swallow By Aesop’s Fables

No Moral. Suggest us a moral of this fable in comment section.
A Hen finding the eggs of a viper and carefully keeping them warm, nourished them into life. A Swallow, observing what she had done, said, “You silly creature! why have you hatched these vipers which, when they shall have grown, will inflict injury on all, beginning with yourself?’