Answer:
Kurt Vonnegut uses Cat's Cradle to create a satire about the absurdity of life and human's pursuit of scientific knowledge and material progress in different ways.
His use of satire is exemplified by the symbolism of the cat's cradle. The cat's cradle is a game that is played with strings and Dr. Hoenikker allegedly played it the day the atomic bomb was dropped instead of retrospection about what he helped invent destroying lots of lives.
The cat's cradle represents the complexity of humans and make a mockery of humans trying to make sense of everything.
Vonnegut also used the set up of the book Cat's Cradle to dispel the notion of how meaningful civilization is. The book can be considered as a book that is talking about the end of the world. By foreshadowing death and the helplessness of humans to prevent death and also the ability to bring death, it shows that the human search for meaning is thus fruitless and misguided.